JPH062428Y2 - Tension-resistant clamp for conductor with optical fiber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a conductor tension clamp for a conductor used for an optical fiber-containing conductor, and in particular for an overhead ground wire containing an optical fiber.

[Conventional technology]

A conventional tension clamp of this type is, for example, shown in FIGS.
As shown in the figure, the conductor guide groove 22 of the clamp main body 21 and the conductor pressing groove 25 of the conductor pressing metal fitting 24 rotatably connected to the clamp main body 21 by the support shaft 23 have the radius of each groove outside the optical fiber-containing conductor 6. It is set slightly larger than the radius,
The conductor 6 is sandwiched between these grooves 22 and 25, and the clamp body 2
The bolt 26 of No. 1 was fitted into the clevis portion 33 of the conductor pressing member 24, and the nut 27 was tightened to sandwich the conductor 6.

[Problems to be solved by the invention]

However, although making the radii of the grooves 22 and 25 slightly larger than the radius of the conductor 6 is much easier to manufacture than matching the outer radius of the conductor 6, when clamped, the conductor 6 is made larger than that of the grooves 22 and 25. There is a drawback that the cross section is distorted because it is compressed in the central cylinder and spreads to both sides.

That is, as shown in FIG. 7, the optical fiber-containing conductor 6 is formed by concentrically forming a plurality of fan-shaped molded aluminum-covered steel wires 31 having a sectoral cross section around the aluminum pipe 30 containing the optical fiber core wire 29 as the center. In addition, a plurality of aluminum alloy wires 32 along the outer peripheral surface of the molded aluminum-covered steel wire 31 are concentrically aligned with the molded aluminum-covered steel wire 31 in the opposite direction (FIG. 8). As shown in FIGS. 9 and 10, the clamp displaces the molded aluminum-covered steel wire 31 and the aluminum alloy wire 32, which are in contact with the central sides of the grooves 22 and 25, in the centering direction, while the side surfaces extruded by this Molded alum covered steel wire 31, aluminum alloy wire 32
Is displaced to the outside, the cross section of the aluminum pipe 30 is deformed into a distorted shape, and there is a risk that the optical communication function of the optical fiber core wire 29 therein is impaired.

The present invention has been made in view of the above points, and is a tension-resistant clamp for an optical fiber-containing conductor, which is capable of firmly clamping the optical fiber-containing conductor having the above-described configuration without impairing its optical communication function. For the purpose of provision.

[Means for solving problems]

In order to achieve this object, in the tension clamp for a conductor containing an optical fiber according to the present invention, a plurality of fan-shaped molded aluminum-covered steel wires having a cross-section are concentrically arranged around the aluminum pipe containing the optical fiber core. In a tension-resistant clamp in which a conductor containing an optical fiber is clamped between the clamp body and a conductor retainer, the radius of each of the conductor guide groove of the clamp body and the conductor retainer groove of the conductor retainer should be the outer radius of the conductor containing the optical fiber. The optical fiber-containing conductor is shortened by a predetermined length, and the entire circumference of the clamped portion of the optical fiber-containing conductor is reduced in diameter by the clamp body and the conductor retainer to be clamped.

[Action]

As shown in FIGS. 2 and 3, the optical fiber-embedded conductor 6 engages with both side edges of the grooves 2 and 5 when fitted in the conductor guide groove 2 and the conductor holding groove 5 of the tension clamp. Grooves 2, 5
There is a gap between and. When the clamping force of the conductor applied to the clamp body 1 and the conductor retainer 4 is gradually increased from the state shown in FIG. 2, the molded aluminum-covered steel wire 31 having a fan-shaped cross section, which comes into contact with both side edges of the grooves 2 and 5, Reference numeral 31 denotes a formed aluminum-covered steel wire 31 which is displaced toward the center of the groove by radially displacing the formed aluminum-covered steel wire 31 near the center of the groove by the centripetal component of the pressing force. When the outer peripheral surface comes into contact with the grooves 2 and 5, the entire circumference of the clamped portion of the optical fiber-embedded conductor 6 is reduced into substantially equal diameters. For this reason, the cross section of the clamp portion becomes almost circular, and the aluminum pipe 30 in the conductor is deformed to a negligible extent.

When the optical fiber-containing conductor 6 is as shown in FIG. 3, the molded aluminum-covered steel wire 31 having a fan-shaped cross section which is displaced in the centripetal direction is a component force in the centripetal direction from the aluminum alloy wire 32 which is in contact with the side edges of the grooves 2 and 5. The shaped aluminum-covered steel wire 31 which is displaced in the radial direction is brought into contact with the groove surface through the aluminum alloy wire 32, and the above-described action is obtained.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. A tension clamp for a conductor containing an optical fiber shown in FIG. 1 is rotatably attached to a conductor guide groove 2 formed in the middle of an upper surface of a clamp body 1 and a spindle 3 at one end of the upper surface of the clamp body 1. The conductor holding groove 5 of the conductor holding metal fitting 4 sandwiches the optical fiber-containing conductor 6 as shown in FIGS. 7 and 8, and is rotatably attached to the other end of the clamp body 1 and the conductor holding metal fitting 4 is attached. Clevis portion 8 formed at the free end of the
A nut 9 is attached to a bolt 7 that can be freely inserted and removed.

The wedge-shaped tension clamp shown in FIG.
The optical fiber-containing conductor 6 is sandwiched between the conductor guide groove 2 and the conductor holding groove 5 of the conductor holding metal fitting 4, and the outer peripheral taper surfaces of the clamp body 1 and the conductor holding metal fitting 4 and the wedge tubular body portion 11 fitted and inserted therein. The conductor 6 is clamped by engagement with the tapered hole 12.

The radius of the conductor guide groove 2 and the conductor pressing groove 5 are made slightly smaller than the outer radius of the optical fiber-containing conductor 6 so that the conductor 6 is sandwiched between the clamp body 1 and the conductor pressing metal fitting 4 to form a substantially groove surface. The conductor 6 is in point contact or surface contact over the entire area.

Since the present embodiment has the above-mentioned structure, the optical fiber-containing conductor 6 is connected to the conductor guide groove 2 as shown in FIGS.
When the conductor 6 is fitted into the conductor holding groove 5, the conductor 6 engages with both side edges of the grooves 2 and 5, and a slight gap is formed between the conductor 6 and the grooves 2 and 5.

As the conductor clamping force applied to the clamp body 1 and the conductor retainer 4 is increased from the state shown in FIG. 2, the molded aluminum covered steel wire 31 abutting the side edges of the grooves 2 and 5 is pressed in the clamping direction. By the component force in the centripetal direction, the formed aluminum-covered steel wire 31 is displaced toward the center of the adjacent groove in the radial direction and is displaced in the centripetal direction.
When the optical fiber-embedded conductor 6 comes into contact with 5, the entire circumference of the clamped portion is reduced in diameter almost equally, and the cross section of the clamped portion becomes substantially circular, so that it is firmly clamped by the clamp main body 1 and the conductor retainer 4. .

As shown in FIG. 3, the formed aluminum-covered steel wire 31 which is displaced in the centripetal direction receives a component force in the centripetal direction from the aluminum alloy wire 32 which abuts against the groove side edge, and the formed aluminum-covered steel wire 31 which is displaced in the radial direction. The steel wire 31 contacts the grooves 2 and 5 via the aluminum alloy wire 32 and is clamped.

The tension clamp for a conductor containing an optical fiber according to the present invention is not limited to the illustrated embodiment, but various modifications can be made within the scope of the invention.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, the entire circumference of the clamped portion of the optical fiber-containing conductor is approximately equalized by the clamp body having the groove radius shorter than the outer radius of the optical fiber-containing conductor by a predetermined length and the conductor retainer. Since the diameter is reduced and clamped, the conductor with an optical fiber can be firmly clamped without impairing its optical communication function.
Further, since the conductor guide groove and the conductor holding groove do not need to be matched with the conductor containing the optical fiber, the manufacture is easy and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention, and FIGS. 2 and 3 are partially cutaway vertical sectional views showing a state where an optical fiber-containing conductor is lightly sandwiched by a tension clamp of the present invention, and FIG. Is a side view of a wedge-shaped tension clamp according to another embodiment of the present invention, FIG. 5 is a plan view of a conventional product, FIG. 6 is a sectional view taken along the line AA in FIG. 5, FIG. 7 and FIG. FIG. 8 is a cross-sectional view of the optical fiber-containing conductor, and FIGS. 9 and 10 are cross-sectional views showing a clamped state of the conventional optical fiber-containing conductor. 1 ... Clamp body, 2 ... Conductor guide groove, 4 ... Conductor pressing metal fitting, 5 ... Conductor pressing groove, 6 ... Optical fiber-containing conductor, 29 ... Optical fiber core wire, 30 ... Aluminum pipe,
31 ... Molded aluminum covered steel wire.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-41709 (JP, A) Actually open Sho-58-22036 (JP, U) Actual-open Sho-47-25994 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A conductor containing an optical fiber, which is formed by concentrically forming a plurality of molded aluminum-covered steel wires each having a fan-shaped cross section around the aluminum pipe containing the optical fiber core, is clamped by a clamp body and a conductor retainer. In the tension clamp, the radius of each of the conductor guide groove of the clamp main body and the conductor holding groove of the conductor holding metal fitting is made shorter than the outer radius of the optical fiber-containing conductor by a predetermined length, and the entire circumference of the clamp location of the optical fiber-containing conductor is reduced. A tension-resistant clamp for a conductor containing an optical fiber, characterized in that the clamp body and the conductor retainer are reduced in diameter and clamped in an approximately equal amount.