JPS5914314A - Method of anchoring pof cable connecting part - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a PO system for preventing cable connections from moving beyond the allowable amount of movement due to thermal expansion/contraction and wave riding phenomena.
This relates to a method for retaining the F cable connection portion.

BACKGROUND OF THE INVENTION An example of a conventional method for retaining a POF cable connection portion is shown in FIG.

10 is a cable, 12 is a connection portion, 14 is a connection box, and 16 is a skid wire. The skid wire 16 is tied with a bind wire 18 near the connection part 12, and the tip 160 of the skid wire 16 is moved by an allowable amount of movement (approximately 50 to 200
+im<lei), and connect it to the junction box 14.

In addition, in "Figure 1" and "Figure 2" below, PO
Only the phase portion of the F cable core is shown. Also, the restraint
Only the left side of the connecting portion 12 is shown (the same method is applied to the right side, which is not shown, as necessary).

As shown in FIG. 1, when the connection 12 moves to the right, the tip 1'60 of the skid wire 16 becomes taut, preventing further movement. Also, when the connection part 12 moves to the left, the tip 1 of the skid wire 16 on the right side (not shown)
60 acts similarly to prevent movement beyond the allowable movement amount.

However, a large force may act and the connecting portion 12 may move more than the allowable amount of movement. In such a case, the skid wire 16 is connected to the cable 10 while being tied to the binding wire 18.
It shifts while rubbing the surface. At that time, cable 1
There is also the possibility that the stainless steel tape wrapped on top of the cable may also shift, damaging the cable insulation and even causing an accident.

However, if the number of turns of the bind wire 18 is made very large, then the wire 16 and the pull 1
If the skid wire 16 strongly grips the cable 10 by wrapping a rubber sheet between the cables 10 (see experimental example below), it is possible to prevent the connecting part 12 from moving beyond the permissible amount of movement. . However, if this is done, when a large force is applied to move the cable, the cable 10 will twist due to the large tension on the skid wire 16.
It was discovered that cable insulation paper can wrinkle.

The object of the present invention is to provide a method for retaining a POF cable contacting portion without the above-mentioned problems.

Configuration of the first invention (1) In a section of appropriate length near the connection part 12,
(2) The skid wire 16, which was conventionally wound only in one direction, can be wound in both directions as in the left-handed skid wire 162 and the right-handed skid wire 164 shown in "Fig. 2." (3) The bidirectionally wound skid wire 16 strongly grips the cable 10 at least/at a location within the bidirectionally wound section; (3) One end of the bidirectionally wound skid wire 16 is attached to the junction box 14; It is characterized by being connected to.

Configuration of the second invention (1) Using the ring 21 placed over the cable 10F, the skid wire 16 is folded back, and an appropriate section is reversely wound and returned. (2) The cylindrical portion 60 and the disc 62 are aligned. The wooden clamp fitting 28 is fixed inside the junction box 14, and its cylindrical portion 60
is placed over the ring 21, and the movement of the ring 21 is restrained using the inner surface of the cylindrical portion 30.

In addition, when winding the skid wire 16 on both the left and right sides, 7
The book skid wire 16 may be folded back and rolled back in the opposite direction, or another skid wire may be used. In the embodiment described later, the above folding method is adopted.

Further, a specific method for strongly gripping the cable 10 by the skid wire 16 will be described in the next embodiment.

In addition, one end of the skid wire 16 may be connected directly to the junction box 14 (see FIG. 5), or the skid wire 16 may be connected to a suitable member (for example, the ring 21 in FIG. 2) once. In some cases, the member is connected to the junction box 14.

Embodiment (FIG. 2) Reference numeral 21 is a ring, which is inserted into the folded part of the skid wire 16 as described above. This is used to simplify the folding process and to ensure that the retaining force is applied uniformly around the circumference of the cable. Moreover, this is a short cylindrical part, and the tip 210 is thick and rounded. Also, before connecting the cable conductor, cover the cable 10 in advance.

A rubber sheet 20 is wrapped around the cable skinned wire at an appropriate interval (approximately 20 to 30 cm) near the junction box 14, and the rubber sheet 24 is wrapped just above the cable core. The ring 21 is placed over the com sheet 24 near the junction box 14.

If the skid wire on the cable 10 is left-handed, for example, the A3 portion at the end of the left-handed skid wire 162 is wound inside the ring 21 near the connection portion 12 . Then turn around at B, pass BC through the outside of ring 21, and C! DKF, this time turn it to the right and return while stacking it on top of the left-handed skid wire 162.

At the end of the right-handed skid wire 164, wrap the bind wire 22 tightly over the GH portion on the rubber sheet 20, bend the HJ portion over the bind line 22, and bind from above. However, this binding is not shown) so that the skid wire firmly grips the cable 10.

Also, near the ring 21, the bind wire 26 is wound over the rubber sheet 24 and the crossing skid wires 162 and 164 in both left and right directions, so that the skid wire is connected to the cable 1.
Make sure to grip 0 firmly.

Then, one end 360 of a suitable tensile strength wire 36 (skid wire may be cut to an appropriate length) is connected to the ring 21 by, for example, welding, and the other end 362 is connected to the ring 21 by, for example, welding.
It is connected to the junction box 14 with a predetermined allowable movement amount.

In addition, in "FIG. 2", only seven skid wires 16 are shown. However, in reality, a large number of skid wires (for example, t wires) are wound with a phase shift.The same procedure as described above is applied to each of these skid wires.

Other embodiments (1) In the case of the third and third figures, in the case of the second invention, in order to hold back the ring 21 for folding the skid wire 16, instead of the above tensile strength line 3B, Use the lamp fitting 28 as shown in the figure.

This clamp fitting 28 is made up of a cylindrical portion 30 and a disc 32 that are made of one piece of wood, and is split into three pieces at a split line 34 so that they can be assembled by appropriate means (not shown). .

The cylindrical portion 30 is placed over the ring 21 as shown in FIG. Further, the disc 32 is fixed to the inner surface of the junction box 14. A taper 300 is provided on the inner surface of the cylindrical filter 0 at one end (in the direction in which the cable 10 is likely to move). Furthermore, in consideration of the case where the cable 10 moves in the opposite direction, a stopper 302 is also provided at the opposite end.

When the cable 10 moves to the left in the figure, the ring 21 catches on the taper 300 and stops further movement. If a split is made in the ring 21, a large brake will be applied to the ring 21 due to the action of the wedge, making it more effective.

When the lamp fitting 28 is used like this, the holding force of the three cables 10 (that is, the amount of movement of the cables 10)
are made equal, and there is no relative misalignment between the three cables 10.

(2) In the case of FIG. 5, instead of using the ring 21 as described above, the folded ABC part of the skid wire 16 is made longer and hooked onto the stopper 68 provided on the connection box 14.

(3) In the case of FIG. 3, the end of the right-handed skid wire 164 that has been folded back is not bent as described above, but is extended to the GKM and connected to the connection box 14.

Experimental example 1 In the method shown in "Figure 2", a rubber sheet 20 with a thickness of 2
．． 24 are wound twice each with a distance of 4 oz. mm (L in Figure 2), and the binding wire 26 is
Three turns of mφ tin-plated annealed copper wire were made at two locations. Further, the bind wire 22 was made of the same plated wire tightly wound, and the HJ portion of the right-handed skid wire 164 was bent onto the bind wire 22, and the same plated wire was bound thereon in three turns at three locations. The cable constructed in this way was able to hold against a tension of 7501 g and did not damage the insulation of the cable 10.

Experimental Example 2 "Figure 1" in which the skid wire 16 is wound only in one direction
In this method, 140 m of the same 2.6 mmφ plated wire 18 as above was wrapped around a 2 mm rubber sheet twice.
It was tightly wound over a length of m. In this case, it was possible to hold the cable against a tension of 9 to 750, but the cable 10
was twisted, and wrinkles appeared on 17 sheets of insulating paper from the outside.

The advantage of the invention is that the skid wire is wound in both left and right directions, and that the skid wire strongly grips the cable at least/at a location within the bidirectional winding section, and then one end of the skid wire is connected to the junction box 14. Since the connecting portion 12 is held in place by the cable, the movement of the connecting portion can be kept within an allowable amount against a strong pulling force, and the cable is not twisted.

Furthermore, in the second aspect of the invention, the retaining forces between the three cables are particularly equal, and relative displacement does not occur.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the prior art; Fig. 2 is a detailed explanatory diagram of the sheep 1 invention; Fig. 3 is a schematic perspective view of the clamp fitting 28 used in the second invention; FIG. 5 and FIG. 3 are explanatory diagrams of another embodiment of the eleventh invention. 10: Cable 12: Connection part 14: Connection box 16: Skid wire 21 Skid wire folding ring 28: Clamp fitting 60: Cylindrical part Patent applicant Fujikura Electric Wire Co., Ltd. Agent Keiji Kunate

Claims (1)

[Claims] (1) In a section of appropriate length near the connection part,
winding the skid wire in both left and right directions, such that the bidirectionally wound skid wire strongly grips the cable at least/at a location within the bidirectionally wound section, and connecting one end of the bidirectionally wound skid wire to a junction box; A method for retaining a POF cable connection portion, characterized by: (Near the looped connection part, use a ring placed over the cable to fold back the dwire, and return while winding it in the opposite direction for an appropriate length section. A method for retaining a POF cable connection, characterized in that a bidirectionally wound skid wire strongly grips the cable, and a cylindrical portion and a disk are used as one to restrain movement of the ring. .