JP3302637B2 - Cable support line exposure tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to laying and pulling in a cable such as a collective drop optical cable in which a plurality of cores (for example, optical fibers) are twisted around a single support line. For wire installation work,
The present invention relates to a tool used for separating a support wire from a bundle of core wires and exposing the support wire.

[0002]

2. Description of the Related Art The purpose of exposing a support wire of a cable from a bundle of core wires as described above is to attach a metal fitting for the support wire to the support wire in a cable laying work, for example, and to wire the core wire at the crossing point. This is for protecting the outer periphery with a spiral sleeve. Therefore, conventionally, a predetermined work is performed by exposing the support wire from the bundle of core wires using a tool such as a wedge-shaped wood piece or a screwdriver.

[0003]

However, it is difficult and time-consuming to completely separate the supporting wire from the bundle of a plurality of core wires. In addition, it is difficult to maintain a gap between the support wire and the bundle of core wires just enough to attach a metal fitting or a spiral sleeve, and during work, a piece of wood or a screwdriver may fall off. . When the core is an optical fiber, if a tool is forcibly inserted, an excessive force may be applied to some of the cores so as to exceed the allowable curvature, or damage may occur to the transmission performance. .

[0004] It is an object of the present invention to make it possible to easily and easily expose a support wire from a bundle of core wires in a short time.
Further, even if the core is an optical fiber, it is possible to prevent the transmission performance from being impaired and to be able to hold the tool so as not to fall.

[0005]

According to the first aspect of the present invention,
It is a tool for separating and exposing the support wire from the bundle of core wires, targeting a cable in which a plurality of core wires are twisted around the support wire around the support wire. A guide claw that can be inserted between the bundle of each core wire and the support wire is formed on a tool body having an outer peripheral surface,
The tool main body is formed with a holding groove through which the support wire can be guided from the guide claw toward the center.

Accordingly, when the cable is laid or the lead-in wire is attached, the outer peripheral surface of the tool body is inserted between the support wire and the bundle of core wires from the distal end side of the guide claw, whereby the support wire is inserted. The work of exposing the wire from the bundle of cords is facilitated, and the time required for the work is also reduced.
In addition, since each core wire is equally and gradually separated from the support line by the arc-shaped outer peripheral surface of the tool body, even if these core wires are optical fibers, some core wires have an allowable curvature. It is possible to avoid a situation in which excessive force is applied or damage is caused, and the transmission performance of the optical cable can be properly maintained. Further, in a state where the support wire and the bundle of core wires are separated, the support wire is led into the holding groove of the tool body, so that the tool is prevented from being detached from the cable during work.

[0007]

Embodiments of the present invention will be described below. FIG. 1 is a perspective view showing a crossing point of the collective drop optical cable. A cable 10 of this kind comprises a support wire 12
And a bundle of a plurality of cores 14 (optical fibers) is twisted around the center. And, at the bridging point, the support wire 12 is exposed from the bundle of the core wires 14, and the outer periphery of the core wire 14 is a spiral sleeve 16.
Protected. The ends of the spiral sleeve 16 are wound around the adhesive tape 18 so that
It is stopped in a bundle of four.

1A, the support wires 12 exposed from the bundle of the core wires 14 are fixed to the intermediate pillars 20 by the suspension fittings 22 as described above. As a means for fixing the hanging fitting 22 to the intermediate column 20, a case using a rivet 23 driven into the intermediate column 20 as shown in the drawing, and a flexible band (not shown) which can be fastened and fixed to the outer periphery of the intermediate column 20 are used. There are cases. On the other hand, the bridging type shown in FIG. 1B is a case where the cable 10 is curved between columns. In this case, a retaining member 24 is fixed to the support line 12 at the intersecting point, and an end of the hanging wire 26 connected to the retaining member 24 is fixed to an intermediate column (not shown).

Note that it is necessary to expose the support wire 12 from the bundle of the core wires 14 not only for the purpose of negotiation, but also for the case where the intermediate branch of the cable 10 is performed to attach the drop wire. is there. At the time of installation work of this lead wire, the support wire for the lead wire is connected to the exposed support wire 12 using a branch metal fitting, and
One of the four lines is branched into a drop line.

FIG. 2 is an explanatory view showing a tool for exposing the support wire 12 separately from the bundle of the core wires 14. As shown in FIG. As shown in this drawing, the support line exposing tool has two tool bodies 3
0, one fall prevention metal fitting 42 and connecting strings 40 and 44 for connecting them. Both tool bodies 30
Have a circular shape in plan view and are connected to each other by the connecting cord 40.

On the other hand, the fall prevention fitting 42 is of a carabiner type, and can be easily hooked on the cable 10. The fall prevention metal fitting 42 includes the connecting cord 44.
Are connected at one end by a ring 46,
The other end of the connecting string 44 is also connected to the connecting string 40 by a ring 46.

FIG. 3 is an enlarged view of one of the tool bodies 30, FIG. 3 (A) is a front view, FIG. 3 (B) is a right side view, and FIG. 3 (C) is a bottom view. It is. As is apparent from these drawings, the outer peripheral surface 32 of the tool main body 30 is a substantially circular arc surface, and the tool main body 30 includes a guide claw 34 projecting outward from the outer peripheral surface 32. ing. The guide claw 34 has a shape in which the thickness t shown in FIG.
Reference numeral 4a denotes an arc surface that smoothly continues to the outer peripheral surface 32 of the tool body 30.

An inner side surface 34b of the guide claw 34 is an arc surface smoothly continuing to one side surface of the holding groove 36 cut from the outer peripheral surface 32 of the tool body 30 toward the center thereof. From these facts, the guide claw 34 is connected to the cable 1
The support wire 12 can be easily inserted between the support wire 12 at 0 and the bundle of the core wires 14, and at this time, the support wire 12 is guided toward the center of the tool body 30 along the holding groove 36. . The tool body 30 is provided with a hole 38 for connecting the connecting string 40.

Subsequently, the work of exposing the support wire 12 of the cable 10 separately from the bundle of the core wires 14 at the time of the laying work of the cable 10 or the installation work of the lead wire to the cable 10 shown in FIGS. explain. First, at the work location, the fall prevention metal fitting 42 is hooked and attached to the cable 10, and then, as shown in FIGS.
As shown by, a guide claw 34 of one tool is inserted into the gap between the support wire 12 and the bundle of the core wires 14 from its tip.

From this state, by rotating the tool main body 30 along the arc shape of the outer side surface 34a and the inner side surface 34b of the guide claw 34, the support wire 12 is moved as shown in FIGS. 5 (A) and 5 (B). 30 is led to the center along the holding groove 36. At this time, the bundle of the core wires 14 is arranged along the outer peripheral surface 32 of the tool main body 30.

By further rotating the tool body 30,
The space between the support wire 12 and each core wire 14 is sufficiently widened by the outer peripheral surface 32, and the support wire 12 is exposed from the bundle of the core wires 14. When the distance is not sufficient, another tool is used in the same manner as described above, and the distance between the two tools is appropriately adjusted so that the support wire 12 is connected to the support wire 12 as shown in FIGS. The distance between each cord 14 is increased.

As described above, each core wire 14 is evenly and gradually supported by the outer peripheral surface 32 of the tool body 30.
In this case, it is possible to avoid a situation in which an excessive force is applied to some of the core wires 14 so as to exceed the allowable curvature or damage occurs. Therefore, even when each of the cores 14 is an optical fiber, it is possible to avoid a situation where the transmission performance of the optical cable is hindered.

When the support wire 12 is exposed separately from the bundle of the core wires 14 as described above, the outer periphery of the core wire 14 is protected by the spiral sleeve 16 as described above, and the exposed support wire 12 is In this way, the hanging fitting 22 or the retaining fitting 24 is fixed. During these operations, the support wire 12 is led into the center of the tool body 30 as shown in FIG.
Since the tension of each core wire 14 is acting on the outer peripheral surface 32, the tool is prevented from coming off the cable 10.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a crossing point of a collective drop optical cable.

FIG. 2 is an explanatory view showing a tool for exposing a support wire separately from a bundle of core wires.

FIG. 3 is an enlarged configuration view of one of the tool bodies.

FIG. 4 is a perspective view illustrating an initial step of an operation of separating a support wire from a bundle of core wires.

FIG. 5 is a perspective view showing an intermediate step of an operation of separating the support wire from the bundle of core wires.

FIG. 6 is a perspective view showing a completed state of an operation of separating a support wire from a bundle of cords.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Cable 12 Support wire 14 core wire 30 Tool main body 32 Outer peripheral surface 34 Guide claw 36 Holding groove

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G02B 6/00, 6/46 B25B 33/00 H02G 1/00-1/14

Claims (1)

(57) [Claims] 1. A tool for separating and exposing a support wire from a bundle of core wires for a cable in which a plurality of core wires are twisted around a support wire around the support wire. A guide claw that can be inserted between the bundle of core wires and the support wire is formed on a tool body having an arc-shaped outer peripheral surface. A support wire exposing tool for a cable, wherein a holding groove capable of guiding the support wire toward a portion is formed.