JPS635671Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a method for removing the cable insulator and the outer semiconducting layer without damaging the internal semiconducting layer of the cable when cutting the tapered part formed at the connection part of the crosslinked polyethylene cable. The present invention relates to a taper cutting jig capable of accurately tapering a conductive layer.

[Technical background of the invention]

When connecting cross-linked polyethylene cables,
It is necessary to cut the insulator and outer semiconducting layer at the connection end into a conical shape.

Conventionally, the above-mentioned cutting has been done manually using a two-handed knife, a one-handed knife, etc., adjusting the taper by eye.

[Problems with background technology]

As mentioned above, since the taper was adjusted by eye and then cut by hand, the taper inevitably became irregular. Further, there was a drawback that the finished shape was largely influenced by the skill level of the operator, and there was a risk of damage to the internal semiconducting layer.

[Purpose of invention]

The present invention was developed based on the above-mentioned circumstances, and an object of the present invention is to obtain a taper cutting jig that can perform taper cutting with a knife well.

[Summary of the idea]

The taper cutting jig of the present invention consists of a taper guide formed by cutting off the circumferential wall of a hollow cylinder with two planes symmetrical to the cylinder axis and inclined at an angle equal to the angle of the taper to be cut with respect to the cylinder axis; A straight part connected to the narrow part of the taper guide and formed by cutting off the peripheral wall at two planes that are symmetrical about the cylinder axis and spaced apart from the cylinder axis by a distance equal to the outer diameter of the internal semiconductive layer, and this straight part. A jig base is provided with a cylindrical shaft in which the sum of the lengths of the straight parts and the length of the straight part is equal to the conductor outlet length at the connection part, and a jig base that engages with the jig base and connects it to the cable core shaft. It is characterized by having a means for restraining in the direction.

[Example of idea]

FIGS. 1A and 1B are a plan view and a side view of an embodiment of the present invention. In these figures, the jig base 1
The taper guide 2 is formed by cutting a hollow cylindrical peripheral wall with an inner diameter approximately equal to the outer diameter of the cable core with two planes arranged symmetrically with respect to the axis and inclined at an angle equal to the taper to be cut with respect to the axis.
and a straight shape connected to the small width part of the taper guide 2 and cut at two planes separated from the axis by the diameter of the internal semiconducting layer of the cable to be cut in a symmetrical arrangement with respect to the axis of the hollow cylinder. It has part 3. In addition, 4 in the figure indicates a stop ring, and the sum of this axial dimension and that of the cylindrical part 5 connected to the straight part 3 becomes the conductor outlet length.

The jig of the present invention having the above configuration is used in the following manner.

First, without attaching the stop ring 4 to the cable core C, the jig base 1 is engaged with the connecting end of the cable core C and held concentrically with the cable core C, and the wide end of the tapered guide 2 is held concentrically with the cable core C. The knife is positioned on the connection end side (right side in the figure) from the tapered cutting part, and the knife is moved along the taper guide 2 to perform rough cutting. This rough cutting is performed by rotating the jig base 1 around the cable core C over the entire circumference. By repeating rough cutting while gradually shifting the jig 1 toward the starting point of the cutting taper (to the left in the figure), the taper cutting can be almost completed. In the figure, C ₁ to C ₅ indicate the order of rough cutting. At this point, the stop ring 4 is engaged with the cable core C, and a pin passing through the through hole 4a is driven into the cable insulator to fix the stop ring 4. Here, the jig base 1 is brought into contact with the stop ring 5, and a knife is slid along the taper guide 2 and the straight portion 3 to perform taper cutting and exposing the internal semiconductive layer.
Note that at this time, the outer semiconducting layer is also scraped off in accordance with the taper of the insulator. The tapered surface cut as described above is finished with sandpaper or the like.

According to the jig of the present invention, since the taper guide 2 regulates the maximum cutting position of the knife, uniform taper cutting can be performed. In addition, the straight part 3
This allows the internal semiconducting layer to be exposed without fear of damage.

FIG. 2, in which the same parts as in FIGS. 1A and 1B are given the same reference numerals, shows another embodiment of the present invention. In this embodiment, the cable core C is fixed by a cleat-type fixing base 6 instead of the stop ring 4, and the jig base 1 is engaged with a hollow shaft 7 provided integrally with the fixing base 6. This embodiment also provides the same effects as the embodiments described above.

Furthermore, in this embodiment, a hollow shaft 7 is provided integrally with a cleat type fixing base 6 for fixing the cable core C.
The jig base 1 is attached to the jig so that it is held concentrically with the cable core, so unlike the jig of the first embodiment, it can be used even when attached to cable cores with different outer diameters. I can do it.

[Effect of idea]

As is clear from the above, the present invention provides a method for manufacturing a cable that can be used to manufacture a cable having a semiconductive outer layer and a semiconductive outer layer.
Since the tapered shape of the insulator can be easily and uniformly cut and the internal semiconductor layer can be exposed without risk of being damaged, the cable connection work can be carried out efficiently.

[Brief explanation of the drawing]

FIG. 1A is a plan view of one embodiment of the present invention, FIG. 1B is a side view thereof, and FIG. 2 is a side view of another embodiment. 2... Taper guide, 3... Straight part, 4... Stopper ring, 5... Cylindrical part.

Claims (1)

[Scope of utility model registration request] A taper guide formed by cutting off the circumferential wall of a hollow cylinder with two planes that are symmetrical about the cylinder axis and inclined at an angle equal to the angle of the taper to be cut with respect to the cylinder axis, and the circumferential wall is connected to the narrow part of this taper guide. A straight part is formed by cutting off two planes that are symmetrical about the cylinder axis and spaced apart from the cylinder axis by a distance equal to the outer diameter of the internal semiconducting layer, and a straight part that is connected to this straight part and has a length that is the sum of the length of the straight part and the straight part. It is characterized by having a jig base including a cylindrical part made equal to the length of the conductor outlet at the connection part, and means for engaging the jig base and restraining it in the axial direction of the cable core. A jig for taper cutting.