JPH0668717A - Linear transmission body - Google Patents

Abstract

PURPOSE:To provide a linear transmission body in which the arrays thereof are hard to get out of shape when it is laid since the external shape of the cross-section of a sheath is a regular hexagon, so that the occupied space can be reduced, and at the same time the multipoint connection box can be miniaturized since the airtightness can be maintained at the time of multipoint connection even though the linear transmission body of the branch side is closely introduced into the multipoint connection box. CONSTITUTION:This linear transmission body is constituted of a core wire 2 for transmitting an electric signal, electric energy, a light signal or light energy, a shielding layer 3 provided in the circumference outside the core wire 2 and a sheath 12 provided in the circumference outside the shielding layer 3, and the external shape of the cross-section of the sheath 12 is a regular hexagon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a linear transmission body such as an electric wire / cable for transmitting electric signals and electric energy, or an optical fiber cable for transmitting optical signals and optical energy (infrared rays, ultraviolet rays, etc.). is there.

[0002]

2. Description of the Related Art A conventional linear transmission body such as an electric wire / cable or an optical fiber cable generally has a structure as shown in FIG. That is, the linear transmission body 1 is for isolating and insulating the core wire 2 that transmits an electric signal, electric energy, optical signal or light energy, and the core wire 2 that is provided around the core wire 2 from external factors such as moisture and electromagnetic waves. Shielding layer 3
And a jacket 4 provided on the outer periphery thereof to mechanically and chemically protect the core wire 2.

The core wire 2 for transmitting electric signals and electric energy has a structure in which an insulating coating 6 such as polyethylene is provided on an electric conductor 5 such as copper or aluminum as shown in FIG. For transmitting optical signals and optical energy, as shown in FIG. 7, a reinforcing coating 8 of urethane, nylon or the like is provided on an optical fiber 7 composed of a silica glass core and a clad.

The insulating layer 3 is made of plastic, paper, metal foil, rubber, organic fiber or the like. Further jacket 4
Is made of an extruded product of polyethylene, vinyl chloride resin or the like, and its cross section has a circular outer shape.

[0005]

The conventional linear transmission body has the following problems. Space occupancy problem The linear transmission body is laid between a signal and energy supply source and a supply destination, but usually not only one line transmission body but also a plurality of line transmission bodies are laid together. However, since the conventional linear transmission body has a circular cross-sectional outer shape, when a plurality of linear transmission bodies 1 are laid together as shown in FIG. 8, mechanical vibrations or shocks are generated during or after the laying work. As a result, the arrangement of the linear transmission bodies 1 is likely to be disturbed. When the arrangement is disturbed, the occupied space becomes large, the number of installable wires is reduced, and there is a risk of collapse of the stacked linear transmission bodies, which is a safety problem.

Problem of Size of Connection Part Usually, when laying a linear transmission body, it is necessary to branch-connect the linear transmission body because the supply destinations of signals or energy are dispersed. 9 and 10 show a general structure of a branch connection portion of a linear transmission body. In the figure, 1A is a trunk side (supply source side) linear transmission body, 1B is a branch side (supply destination side) linear transmission body, and 9 is a branch connection box.

The core-side linear transmission body 1A and the branch-side linear transmission bodies 1B are connected to each other in the branch connection box 9 by connecting means such as connectors (not shown). The branch connection box 9 is provided to isolate and insulate the connection part of the core wire from external factors such as moisture and electromagnetic waves, and to protect it mechanically and chemically. It is made of polypropylene, rubber, unsaturated polyester or aluminum. And the like. Since the branch connection box 9 needs to have an airtight structure, a low melting point thermoplastic resin layer or an adhesive resin layer such as butyl rubber is provided between the branch connection box 9 and the linear transmission bodies 1A and 1B.
Airtightness is maintained by heat fusion or pressure bonding.

However, since the linear transmission body has a circular cross section,
In the structure in which a plurality of branch side linear transmission bodies 1B are introduced into the branch connection box 9 in a state of being bundled, a gap is created and airtightness cannot be maintained. Therefore, the branch side linear transmission body 1B is shown in FIG. As described above, it is necessary to separate them one by one and introduce them into the branch connection box 9, and fuse or crimp with each branch connection box 9 one by one. Due to this fusing or crimping work, 1 to 4 are placed between the branch side linear transmission bodies 1B.
A space of about cm is required.

As a result, the outer diameter of the branch connection box 9 becomes considerably larger than the outer diameter required for connecting the core wires, and therefore the size of the manhole, handhole, duct or the like for housing the branch connection box 9 is also small. Since it becomes large, there is a problem that the installation cost becomes very high.

[0010]

DISCLOSURE OF THE INVENTION The present invention provides a linear transmission body which solves the above-mentioned problems, and has a structure for transmitting electric signals, electric energy, optical signals or optical energy. In one having a line and an outer cover that covers the outer circumference of the line, the outer shape of the cross section of the outer cover is a regular hexagon.

[0011]

When the outer cross section of the jacket is a regular hexagon, it is possible to arrange a plurality of linear transmission elements without gaps, and it becomes difficult for the arrangement to collapse due to vibration or shock, so that the line transmission elements are occupied in the installed state. It is possible to reduce the space. Moreover, even in the case of branch connection, since the linear transmission bodies on the branch side can be joined to each other face-to-face, no space is required between the linear transmission bodies on the branch side, and the branch connection box can be made compact. Can be converted.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. This linear transmission body 11 isolates and insulates the core wire 2 that transmits an electric signal, electric energy, an optical signal or light energy from the core wire 2 that is provided around the core wire 2 from external factors such as moisture and electromagnetic waves. The shielding layer 3 and mechanically provided on the outer periphery thereof,
It is characterized in that it is composed of an outer cover 12 for chemically protecting the core wire 2 and that the outer shape of the outer cover 12 has a regular hexagonal cross section. The materials of the core wire 2, the shielding layer 3, and the outer cover 12 are the same as those of the conventional one.

FIG. 2 shows an example of a state in which the linear transmission bodies 11 of FIG. 1 are laid, and since the linear transmission bodies 11 can be stably laid in a state where they are in surface contact with each other, arrangement disorder is prevented. This has the advantage that the occupied space can be reduced. 1
Although reference numeral 3 is a spacer for preventing positional deviation, this spacer can be omitted.

Next, FIGS. 3 and 4 show the linear transmission body 1 of FIG.
1 shows a branch connection. 11A is a linear transmitter on the trunk side, 1
Reference numeral 1B is a linear transmission body on the branch side, and 14 is a branch connection box. The plurality of linear transmission bodies 11B on the branch side are sandwiched by pressure-sensitive adhesives sandwiched between them, or sandwiched by a low-melting-point adhesive resin sheet in which a heater is embedded and heated by energization.
The two are airtightly joined together. Therefore, the linear transmitter 11B
Since it is not necessary to provide a gap between them, the branch connection box 14 can be significantly downsized.

[0015]

As described above, in the linear transmission body according to the present invention, the outer cross section of the outer cover is a regular hexagon.
The arrangement state when installed is difficult to collapse, the occupied space can be reduced, and at the time of branch connection, even if a plurality of linear transmission bodies on the branch side are brought into close contact with each other and introduced into the branch connection box, airtightness can be maintained, There is an advantage that the branch connection box can be miniaturized.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a linear transmission body according to the present invention.

FIG. 2 is a cross-sectional view showing a laid state of the linear transmission body in FIG.

FIG. 3 is a front view showing a branch connection portion of the linear transmission body of FIG. 1.

FIG. 4 is a sectional view taken along line P-P in FIG.

FIG. 5 is a perspective view showing a conventional linear transmission body.

FIG. 6 is a perspective view showing an example of a core wire of a linear transmission body.

FIG. 7 is a perspective view showing another example of the core wire of the linear transmission body.

FIG. 8 is a cross-sectional view showing a laid state of a conventional linear transmission body.

FIG. 9 is a front view showing a branch connection portion of a conventional linear transmission body.

10 is a cross-sectional view taken along the line QQ of FIG.

[Explanation of symbols]

 2: Core wire 3: Shielding layer 11: Linear transmission body 12: Outer sheath 14: Branch connection box

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H01B 11/22 7244-5G

Claims (1)

[Claims] 1. A core wire for transmitting an electric signal, electric energy, an optical signal or light energy, and an outer cover covering the outer circumference of the core wire, wherein the outer shape of the cross section of the outer cover is a regular hexagon. A linear transmitter.