JP2516103Y2 - Communication cable connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention provides a novel communication cable having a cable sheath in which an outer sheath is integrally provided with a laminated tape in which, for example, an aluminum tape and a plastic tape are laminated. Connection structure.

[Prior Art] For example, a soft aluminum tape with a thickness of about 0.2 mm is laminated with a plastic tape that is easily adhered to polyethylene, which is a material for the sheath, to form a composite tape, and the composite tape is formed vertically on the cable core. Since the laminated sheath type communication cable formed by covering the polyethylene and integrating the same has been proposed, the excellent moisture resistance of the cable, the shielding effect by the metal tape, or the small shrinkage of the sheath with time, The advantages of being easy to handle have been evaluated, and the communication cable of the conventional configuration has become the mainstream of today.

The metal tape used for the laminating tape includes copper and lead in addition to the above-mentioned aluminum tape, and the plastic or sheath material to be laminated is not limited, but for the sake of simplicity, the metal tape will be described below. A typical example using an aluminum tape as the above and a polyethylene tape as the plastic tape and the sheath material will be described as a specific example. FIG. 7 is an explanatory view having a partial cross section showing an example of the constitution of an aluminum laminated polyethylene sheath communication cable, FIG. 8 is a cross sectional explanatory view thereof, and FIG. 9 is a part of a dashed line circle A in FIG. FIG.

1,1 is a cable core wire, and the required number of core wires (for example, a metal cable with a plastic insulation coating on a copper wire, and an optical fiber cable with a glass fiber on a plastic coating) The gathered outer periphery is pressed and wrapped with a plastic retaining tape 2, and a laminated aluminum tape 3 is vertically attached to the outer periphery to form a cylindrical shape, and the overlapping portion 3c (see FIG. 8) is bonded with an adhesive or They are joined by heat fusion or the like, and the carbon-containing polyethylene sheath 4 is extrusion-coated thereon.

The laminated aluminum tape 3 is more specifically a ninth
As shown in the enlarged explanatory view of the figure, the aluminum tape 3a is provided on the inside and the polyolefin tape 3b is provided on the outside (in some cases, a plastic tape is provided on the inside of the aluminum tape 3a as well, so that a three-layer laminate structure is formed). In some cases, there is no difference in that the plastic layer is arranged on the outer side in this case as well), and the polyethylene sheath 4 is extrusion-coated on the outer periphery thereof, and at this time, the polyolefin tape 3b of the laminated aluminum tape 3 and the polyethylene seal 4 are Are fused together by the heat of fusion in melt extrusion. As a result, the aluminum tape 3a and the sheath 4 are firmly integrated with each other, and the overlapping portion 3c of the laminated aluminum tape 3 is completely joined as described above. The aluminum tape 3a exerts an electrostatic shielding effect while it is exerted and prevents a line failure due to moisture mixture. In addition, since the aluminum tape 3a is integrated with the sheath 4, it has the advantage that the contraction of the sheath and the ease of handling in bending as described above can be obtained.

In order to connect the laminated sheath type communication cable having the above-mentioned structure and characteristics, the connection has been conventionally made with the connection structure shown in FIG.

That is, the sheath 4 of the cable to be connected is stripped together with the integrated laminated aluminum tape 3 to form a core wire.
1 and 1 are exposed for an appropriate length, and the core wires 1 and 1 are connected to each other at the core wire connecting portion 1a.
Connect each at.

In this case, in order to maintain the above-mentioned electrostatic shielding effect on the aluminum tape 3a (see FIG. 9), the aluminum tape 3a may be grounded individually or the aluminum tapes of the cables to be connected may be connected to each other.
It is necessary to electrically connect 3a and 3a and ground at the end of the entire cable. The taper sleeve 20, the press fitting 21, the metal frame 22 and the connecting conductor 13 are such aluminum tapes 3.
It is provided to electrically connect a and 3a to each other.

This will be described in detail. A vertical cut as shown in FIG. 6 is made in a laminated sheath at the end portion (which means the laminated sheath here, the laminated aluminum tape 3 and the sheath 4 are integrated. The same applies hereinafter). Put the vertical tear part 5,5
A plurality of points are formed so that the terminal portion can be opened like a bosh, and the taper sleeve 20 is inserted into the opened inside as shown in the longitudinal sectional explanatory view shown in FIG.
21 is screwed in with the screw 23, the laminated aluminum tape 3 and the polyethylene sheath 4 are pressed between the taper sleeve 20 and the pressing metal fitting 21, and the taper surface of the taper sleeve 20 and the aluminum tape 3a are forcibly contacted. , The connecting conductor 13 connects the taper sleeve 20 and the metal frame 22 as shown in FIG.
The aluminum tapes 3a, 3a of the left and right cables in the figure are electrically connected to each other. In FIG. 4, reference numeral 24 is a connection case that houses the entire connection portion.

[Problems to be Solved by the Invention] According to the above-described conventional connection structure, it is necessary to vertically split the end portion of the laminate sheath into a plurality of pieces, which is troublesome. Moreover, the connection work is often performed outdoors, and it is necessary to exercise caution when performing the above-mentioned tearing work without damaging the cable core wire outdoors, where environmental conditions are likely to change. It is a time-consuming and arduous task.

In addition, there is a problem that the taper sleeve 20 and the press fitting 21 are required at the connecting portion, and the cost is high as a whole including the assembly work. There is also a demerit that the connection length assigned to the cable core wire becomes short.

Moreover, if the aluminum tapes are simply electrically connected to each other, the conventional structure described above has the dislike of being robust and exaggerated, and it can be said that the structure is obviously overdesigned.

The object of the present invention is to solve the above-mentioned problems of the prior art, to simplify, to reduce the number of parts, and to make the whole compact, and moreover, to stably and reliably perform the electrical connection of the aluminum tape. The present invention aims to provide a new communication cable connection structure that can be used.

[Means for Solving the Problems] The present invention relates to the connection of a communication cable in which a laminating tape formed by laminating a metal tape and a plastic tape is integrally coated on the inside of a plastic sheath, and stripped for connection. A grip connecting fitting having a tongue piece for the sheath, which is brought into contact with the outer surface of the sheath, and a tongue piece on the metal tape side that can be inserted between the metal tape and the cable core side, The grip connecting fitting is formed in a substantially U shape by stacking and connecting a plurality of U-shaped laminated pieces of a small width made of a conductive spring material in the width direction, and is formed in a substantially U shape. The distance between the tongues is configured to be somewhat smaller than the total thickness of the laminated tape and the plastic sheath, and the tongue for sheath and the tongue on the metal tape side face each other. A protruding piece such as a tooth for strengthening the abutting and fixing when gripped is formed, and a connecting conductor for electrically connecting the metal tape side tongue that is in contact with the metal tape is provided on the It has been done.

According to a second aspect of the present invention, in the above configuration, "the grip connection fitting is formed into a substantially U-shape by stacking and connecting a plurality of U-shaped laminated pieces each having a small width and made of a conductive spring material in a width direction. "The grip connection fitting is bent into a substantially U shape by the conductive spring material, and a plurality of slits parallel to the fitting direction of the fitting into the sheath are provided in the vicinity of the bent portion. Was formed ”.

[Operation] The end portion of the laminated sheath is gripped by a grip connecting fitting having a metal tape side tongue that can be inserted between the metal tape and the cable core side and a sheath tongue that abuts the sheath, and the sheath tongue is gripped. Connection between the metal tape side tongue and the metal tape side tongue that are in contact with the metal tape. If the conductor is provided, the aluminum tape of the laminated sheath can be electrically connected simply by inserting the grip connecting fitting from the end of the laminated sheath with one touch.

Moreover, if the teeth capable of firmly fixing each of the tongue pieces are provided on the inner side, there is no fear that the connecting fitting will come off. As a result, it is possible to completely omit the conventional tearing operation of the laminated sheath end portion and achieve not only a great simplification of the work, but also a significantly smaller and compact overall structure, Overall, a significant cost reduction effect can be expected.

[Examples] The present invention will be specifically described below with reference to Examples.

FIG. 1 is a perspective view showing an embodiment of a holding metal fitting 10 according to the present invention, and FIG. 2 is an explanatory view showing a state in which it is inserted into a terminal of a laminate sheath and mounted.

In the present embodiment, the grip connection fitting 10 is made of a conductive spring material such as phosphor bronze or beryllium copper, and has a plurality of U-shaped laminated pieces 10a, 10a having a small width and laminated pins 18 (this is a screw). It may have a hook-like structure of a predetermined width, which is substantially U-shaped and is laminated and connected in the width direction.

When the grip connecting fitting is composed of a plurality of laminated pieces in this way, the shape deformation in the width direction is made flexible, and it is possible to avoid applying unreasonable stress to the laminate sheath. The width and the number of the laminated pieces 10a may be appropriately determined in consideration of the size of the target cable.

Reference numeral 11 is an aluminum tongue that is configured to be inserted into the gap between the cable core side and the aluminum tape, and 12 is formed so as to face the aluminum tongue 11 and contacts the outer surface of the laminate sheath. It is a sheath tongue that can be pressed. The tongues 11 and 12 have opposite resistances on the inner sides, which are not so resistant when inserting the connecting metal fitting 10, but can be bitten to cause a great pulling resistance when the connecting metal fitting 10 is to be extracted.
11a and 12a are formed as shown in the figure, and have a structure in which they are not easily removed after being inserted once.

On the other hand, the gap G formed by the aluminum tongue piece 11 and the sheath tongue piece 12 is configured to be somewhat smaller than the thickness of the laminated sheath, and is smaller than the U-shaped opening of the connecting fitting 10 by the second.
As shown in the figure, when it is fitted and fitted to the end of the laminated sheath, the gap G is expanded to some extent, thereby causing the spring action of the conductive spring material, and elastically gripping the laminated sheath with the spring force. In particular, the contact pressure of the aluminum tongue piece 11 to the aluminum tape can be generated, and the mechanical and electrical contact pressure between the aluminum tongue piece 11 and the aluminum tape can be obtained. .

Reference numeral 13 is a connection conductor which is connected and fixed to the grip connection fitting 10 by a terminal 13a.By connecting this connection terminal 13 and the same connection conductor 13 on the other side by an appropriate means, the aluminum tapes of the other side cables are mutually connected. It is electrically connected. Incidentally, 13b is a terminal screw for fixing the connection conductor 13.

FIG. 3 is a perspective view showing another embodiment according to the present invention, and portions having the same reference numerals as those shown in FIGS. 1 and 2 in the present embodiment have the same reference numerals as in FIGS. Since the configuration is substantially the same as the configuration described above, individual description will be omitted below.

The present embodiment shows an example in which a plurality of slits 19 and 19 are provided in the vicinity of the U-shaped bent connection fitting 10 having a U-shaped bent portion. By forming the slits 19, a certain degree of deformability in the width direction can be obtained as in the embodiment of FIG. 1, an unreasonable burden is imposed on the laminate sheath, and the spring force can be variously changed depending on how the slits are formed. There are advantages. Also in this case, the gap G needs to be smaller than the thickness of the laminate sheath. 13b is a terminal screw like the above.

Needless to say, the shapes and positions of the teeth as the protruding pieces in each of the above-described embodiments can be changed as appropriate, and the shapes are not particularly limited to those shown in the embodiments.

Further, when it is necessary to avoid corrosion due to contact with a dissimilar metal with the aluminum tape, it is possible to prevent corrosion between dissimilar metals due to a difference in electrode potential, for example, by applying aluminum plating. Of course, the contact conductor 13 may be directly used for grounding.

[Advantage of Invention] As described above, according to the present invention, the following excellent effects can be exhibited.

(1) The work of tearing the end portion of the laminated sheath is not required, and significant labor saving can be achieved, and the number of parts can be reduced to achieve cost reduction and size reduction.

(2) You can work with a single screwdriver, and no special tools are required.

(3) Since the parts are integrated, handling is easy and there is no risk of loss.

(4) It is possible to obtain the initial gripping force for securing the pulling force.

(5) Long-term reliability can be obtained because the structure is such that the spring pressure is always applied to the electrical connection portion.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a grip connecting fitting according to the present invention, FIG. 2 is an explanatory view showing its mounting state, FIG. 3 is a perspective view showing another embodiment, and FIG. FIG. 5 is an explanatory view having a cross section showing a connection structure, FIG. 5 is a vertical cross sectional explanatory view showing a structure in the vicinity of a laminate sheath terminal in a conventional connection structure, and FIG. 6 is a cut into a laminate sheath terminal for connection in the conventional example. FIG. 7 is a longitudinal sectional explanatory view showing the structure of the laminated sheath type communication cable, FIG. 8 is a lateral sectional explanatory view thereof, and FIG. 9 is within a chain line circle A of FIG. FIG. 1: Core wire, 2: Presser winding tape, 3: Laminate tape, 4: Polyethylene sheath, 10: Grip connection fitting, 10a: U-shaped laminated piece,
11: Aluminum tongue, 11a: Teeth, 12: Sheath tongue, 12a: Teeth,
13: connection conductor, 18: laminated pin, 19: slit.

Claims (2)

(57) [Scope of utility model registration request] 1. A connection of a communication cable in which a laminating tape formed by laminating a metal tape and a plastic tape is integrally coated on the inside of a plastic sheath, and the laminating tape and the plastic sheath are stripped off for connection. The end portion of the grip is connected with a grip connecting fitting having a sheath tongue that is brought into contact with the outer surface of the sheath and a metal tape-side tongue that can be inserted between the metal tape and the cable core side. , Small width U made of conductive spring material
A plurality of character-shaped laminated pieces are laminated and connected in the width direction to form a substantially U-shape, and the distance between the metal tape side tongue and the sheath tongue is set to be somewhat smaller than the total thickness of the laminate tape and the plastic sheath. The inside of the sheath tongue and the metal tape side tongue facing each other,
A protruding piece such as a tooth that strengthens abutting and fixing when gripped is formed, and a connecting conductor for electrically connecting the metal tape side tongue that is in contact with the metal tape is provided. Communication cable connection structure. 2. A connection of a communication cable in which a laminating tape formed by laminating a metal tape and a plastic tape is integrally coated on the inside of a plastic sheath, and the laminating tape and the plastic sheath are stripped off for connection. The end portion of the grip is connected with a grip connecting fitting having a sheath tongue that is brought into contact with the outer surface of the sheath and a metal tape-side tongue that can be inserted between the metal tape and the cable core side. , Is bent into a substantially U shape by a conductive spring material, and a plurality of slits are formed in the vicinity of the bent portion in parallel with the inserting direction of the metal fitting into the sheath, and the metal tape side tongue piece and the sheath tongue piece are formed. The gap between the strips is configured to be somewhat smaller than the total thickness of the laminated tape and plastic sheath, and the sheath tongue and metal tape side tongue are On the inner side of direction,
A protruding piece such as a tooth that strengthens abutting and fixing when gripped is formed, and a connecting conductor for electrically connecting the metal tape side tongue that is in contact with the metal tape is provided. Communication cable connection structure.