JP2004266909A - Terminal box for cable connection - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal box for cable connection which can enhance the lightfastness of the junction of a cable, where the core covered with a color insulator is exposed, with relatively low-cost constitution. <P>SOLUTION: A junction 4 of a cable 2 is threaded and housed in a body 1 of a terminal for connection, and the junction 4, where a core 3 is exposed by the stripping of a housing, is surrounded by a light-shielding sheet 6. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a structure of a cable connection terminal box used when branching a drop-in wire from a communication metal wire (CCP cable) or an optical fiber cable installed outdoors.
[0002]
[Prior art]
Conventionally, the terminal box for cable connection has been used to peel off the jacket at a part of the cable inserted into the terminal box body to form a branch connection part where the cores are exposed, and if necessary, The lead wire connected to the core wire is derived from the terminal box (see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 02-228212
[Problems to be solved by the invention]
Although the terminal box body protects the branch connection portion of the inserted cable, external light slightly penetrates because it is configured to be opened and closed for the connection operation. For this reason, for a long period of time (for example, 5 to 10 years), the intruded external light is irradiated to the core wire group at the branch connection site, and the resin insulator covering the core wire has entered. Light (especially ultraviolet light) gradually deteriorates, and when the terminal box body vibrates due to wind or the like and adjacent core wires rub against each other, the deteriorated insulator cracks or peels off, causing In some cases, adverse effects such as a reduction in signal voltage, line failure, and the like may occur.
[0005]
Of course, if an ultraviolet absorber such as carbon is added to the insulator, a core having high light resistance can be formed. However, the core insulator must be colored in various colors other than black to facilitate identification, and the core insulator must be low in light resistance. . In particular, a white or yellow insulator is particularly low in light resistance and is apt to deteriorate, and the above-mentioned phenomenon is likely to occur. Many components to be contained in the insulator of the colored core wire (other than black) in order to exhibit light resistance performance generate harmful substances such as halogen compounds. Therefore, in the conventional configuration, there is a concern about adverse effects on the environment.
[0006]
Further, since air enters and exits from the terminal box main body due to a temperature difference between the inside and the outside, moisture that has entered the inside of the box forms dew, and the condensed water adheres to the core wire, so that the insulator easily deteriorates.
[0007]
[Means for Solving the Problems]
The present invention has the following configuration to solve the above problems.
[0008]
That is, the terminal box for cable connection of the present invention is a terminal box main body in which a cable formed by covering a core group with a jacket is inserted, and the sheath is peeled off in the terminal box body, and the core group is And a light-shielding sheet surrounding the branch connection portion formed by being exposed.
[0009]
According to this configuration, even if ultraviolet rays enter the terminal box body, the ultraviolet rays are not irradiated to the branch connection portion surrounded by the light-shielding sheet, and the insulator of the core wire is prevented from being deteriorated by the ultraviolet rays. Is done.
[0010]
Note that the light-shielding sheet is formed of a flat sheet that can be folded in half, and the branch connection portion of the cable is inserted and inserted between the two folded light-shielding sheets, and is opposed to the two-folded light-shielding sheet. It is preferable that the peripheral edges to be overlapped and joined so as to be separable.
[0011]
Then, the developed light-shielding sheet is wrapped around the branch connection part of the cable inserted into the terminal box main body, folded in two, and the peripheral edges of the light-shielding sheet that are folded in two and opposed to each other using a hook-and-loop fastener etc. By overlapping and joining, it is possible to entirely cover the branch connection site where the core wire is exposed.
[0012]
In this case, even if a lead wire is connected to some of the core wires, the lead wire can be led out of the sheet through the overlap joining portion of the light shielding sheet.
[0013]
Also, by releasing the overlap bonding of the light-shielding sheets, the sheets can be opened, and a new lead wire connection process can be performed.
[0014]
Preferably, a heat insulating material is accommodated inside the light shielding sheet surrounding the branch connection portion of the cable.
[0015]
Then, even when moisture enters the inside of the light-shielding sheet, dew condensation hardly occurs.
[0016]
Preferably, a moisture absorbing material is accommodated in the light shielding sheet surrounding the branch connection portion of the cable.
[0017]
Then, even if moisture enters the inside of the light-shielding sheet, it is absorbed by the hygroscopic material and dew condensation is suppressed.
[0018]
In addition, it is preferable that a tape-shaped or band-shaped fastening member that is wound tightly along the outer periphery of the cable at both ends of the light-shielding sheet and fastens the light-shielding sheet is provided.
[0019]
Then, air containing moisture enters the sheet through a gap formed between the core wires of the cable, or air containing moisture passes through the gap between the outer peripheral surface of the cable and the light-shielding sheet. Is prevented from entering.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
FIG. 1 is a side view of a cable connecting terminal box according to the present invention, and FIG. 2 is a front view of the terminal box.
[0022]
The connection terminal box main body 1 is attached outdoors to a suspension line installed on a telephone pole or the like, is formed in a box shape having a house-shaped cross section, and a communication cable 2 is inserted through front and rear walls thereof. Have been. The cable 2 includes a metal cable (for example, a CCP cable: Color Code Polyethylene Cable) or an optical fiber cable.
[0023]
Inside the connection terminal box main body 1, a jacket of the cable 2 is peeled off over a predetermined length to form a branch connection portion 4 where a large number of core wires 3 are exposed.
[0024]
Each of the cores 3 is covered with an insulator made of polyethylene resin colored white, yellow, blue, green, or the like for easy identification. A wire 5 extends from the bottom surface of the connection terminal box main body 1.
[0025]
The branch connection portion 4 from which the cores 3 are exposed is surrounded by a light-shielding sheet 6 made of a black polyethylene sheet, so that the cores 3 having low light resistance penetrate into the connection terminal box main body 1. It is configured not to be exposed to.
[0026]
When the light-shielding sheet 6 is developed, as shown in FIG. 3, it is formed in a vertically symmetrical substantially hexagonal shape having protruding portions 6a at the left and right ends of the upper and lower middle portions. As shown in FIG. 4, by folding the cable 2 around the branch connection portion 4 of the cable 2, the branch connection portion 4 can be entirely covered. The upper half 6b and the lower half 6c of the peripheral edge of the light-shielding sheet 6 are provided with hook-and-loop fasteners 7a and 7b, respectively. By joining the lower end 6c of the peripheral end side via the hook-and-loop fasteners 7a and 7b, the entire branch connection portion 4 is covered and shielded by the light-shielding sheet 6. The projecting portion 6a of the light-shielding sheet 6 is wound around the branch connection portion 4, and an adhesive tape 8 is wound and adhered thereon, so that both ends of the light-shielding sheet 6 are in close contact with the outer periphery of the branch connection portion 4. ing. The lead-in line 5 is drawn out of the light-shielding sheet 6 through the overlapping joint of the sheet.
[0027]
By attaching the light-shielding sheet 6 and covering the branch connection portion 4 as described above, it is possible to prevent the core group 3 having low light resistance from being exposed to ultraviolet rays that have entered the connection terminal box main body 1 and deteriorated. are doing.
[0028]
The present invention can be implemented in the following modes.
(1) As shown in FIG. 5A, when a heat insulating material 11 made of a foamed resin material or the like is provided on the inner surface of the light-shielding sheet 6, moisture that has entered the sheet is condensed due to a temperature difference between the inside and the outside. Thus, it is possible to suppress the adhesion to the core wire 3. In addition, as the heat insulating material, besides the foamed resin material, a bubble sheet material provided with an air insertion layer in a resin sheet used for a packing material or the like can be used.
(2) As shown in FIG. 5 (b), by adhering a hygroscopic material 12 such as a hygroscopic tape or a hygroscopic sheet to the inner surface of the light-shielding sheet 6, moisture entering the sheet is dewed and condensed. 3 can be suppressed.
(3) As means for detachably joining the overlapping portions of the light-shielding sheet 6, in addition to using the surface fasteners 7a and 7b as described above, a tape for detachably fitting a resin-molded uneven strip is used. Can also be used.
[0029]
【The invention's effect】
As is clear from the above description, the following effects can be expected according to the present invention.
[0030]
With a simple and inexpensive configuration simply by attaching a light-shielding sheet, it has become possible to enhance the light resistance of the branch connection portion of the cable in which the core is exposed by being inserted into the connection terminal box main body.
[0031]
Furthermore, in order to improve the light resistance performance in this way, it is no longer necessary for the insulator covering the core wire to have excessive light resistance. Many of the components contained in the insulator of the core wire for exhibiting the light resistance performance generate harmful substances such as halogen compounds. On the other hand, in the present invention, the light resistance of the cable can be improved without adding a light-resistant component to the core wire. Therefore, in the present invention, adverse effects on the environment can be eliminated.
[0032]
In addition, the light-shielding sheet can be easily mounted or opened at the branch connection site in the cable inside the connection terminal box main body, and the handleability and workability are excellent.
[0033]
Further, by insulating the branch connection portion, it is possible to prevent the dew condensation of the moisture that has entered the light-shielding sheet, and to suppress the progress of deterioration of the core wire.
[0034]
Further, by absorbing the moisture that has entered the light-shielding sheet, the occurrence of dew condensation can be prevented, and the progress of deterioration of the cord can be suppressed.
[0035]
Further, it is possible to reliably prevent moisture from entering the light-shielding sheet, and to suppress the progress of deterioration of the cord.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional side view of a cable connection terminal box according to the present invention.
FIG. 2 is a longitudinal sectional front view of a cable connection terminal box according to the present invention.
FIG. 3 is a developed plan view of a light-shielding sheet.
FIG. 4 is a perspective view showing a state where a light-shielding sheet is folded in two.
FIG. 5 is a longitudinal sectional front view showing another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Connection terminal box main body 2 Cable 3 Core wire 4 Branch connection part 6 Light-shielding sheet 8 Adhesive tape 11 Heat insulation material 12 Moisture absorbing material

Claims (5)

A terminal box main body into which a cable formed by covering a core group with a jacket is inserted,
A light-shielding sheet surrounding a branch connection portion formed by exposing the sheath and exposing the core wire group in the terminal box main body,
Terminal box for cable connection characterized by having. The terminal box for cable connection according to claim 1,
The light-shielding sheet is composed of a foldable flat sheet,
The branch connection portion of the cable is sandwiched and inserted between the two folded light-shielding sheets, and opposing peripheral edges of the two-folded light-shielding sheets are separated and overlapped and joined.
A terminal box for cable connection, characterized in that: The terminal box for cable connection according to claim 1 or 2,
Having a heat insulating material stored inside the light-shielding sheet,
A terminal box for cable connection, characterized in that: The cable connection terminal box according to any one of claims 1 to 3,
Having a hygroscopic material stored inside the light-shielding sheet,
A terminal box for cable connection, characterized in that: The terminal box for cable connection according to any one of claims 1 to 4,
A terminal box for cable connection, comprising: a tape-shaped or band-shaped fastening member wound in close contact with the outer periphery of the cable at both ends of the light-shielding sheet to fasten the light-shielding sheet. .

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