JP2000217217A - Call wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the resistances of a call wire against compressive forces and tractive forces by elongating a synthetic resin wire rod having a polygonal cross section and, at the same time, forming spiral ridge lines on the external surface of the wire rod by twisting the wire rod. SOLUTION: After a synthetic resin wire rod 1 obtained by extruding a polyester resin from the die of a resin extruder formed in an equilateral triangle having rounded apexes is elongated in the axial direction to a required multiplying factor, the wire rod L is naturally or forcibly cooled and wound around a drum, etc. In another process, three spiral ridge lines 2 composed of the linear ridge lines constituting the apexes 11 of the triangular shape of the die of the extruder are formed on the external surface of the wire rod L by twisting the rod L at a rate of 20 times/m, 30 times/m, etc., and shaping the twisted rod L by heating while the rod L is passed through a heating booth. Therefore, a call wire which has a light weight can be used easily, and has high resistances against compressive forces and tractive forces can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable pull-in wire used to draw electric wires, telephone lines, optical cables and the like into a protective tube to protect these wires, that is, a cable having a nominal line in the art. Regarding the wires being called.

[0002]

2. Description of the Related Art A typical representative wire of this type in the related art is:
As shown in FIG. 10, a polyester resin wire having a circular cross section was extruded and stretched to obtain a wire 01.
Was used as a material, and three twisted wires were subjected to twist rotation while heating the three twisted wires, and heat-treated to maintain the shape. The stranded wire T made in this way was
This is known from Japanese Patent Application Publication No. 1-222424. In addition, as a stranded wire of this kind devised thereafter, the Japanese
As disclosed in Japanese Patent Publication No. 16566, it has been proposed that the above-described three-stranded wire is connected at its inscribed central portion to form a modified three-stranded wire in the form of a single wire.

As shown in FIG. 11, this type of stranded wire T has a distal end guide fitting G provided at one end of the stranded wire T with a hole h for connecting a cable drawn into a pipe. The connected short flexible wire Y is connected via a cylindrical connection fitting S. In this way, a so-called product line is formed. However, in the present specification, a wire material that mainly forms a call line before the distal end guide fitting or the like is attached is referred to as a call line for convenience.

[0004]

The above-mentioned three-stranded wire T, which has been implemented immediately after the filing of the former invention, has been used in the industry for many years to this day. It has been widely used without any trouble between persons. However, in recent years, the length of cable protection tubes has been gradually lengthened, and the frequency of complicated bent pipes has been increasing. Accordingly, long nominal wires have also been required. There is an increasing demand for a nominal wire having a high compressive strength and a high tensile strength while being a wire rod that is easy to use.

[0005] The inventor of the present invention has conducted various studies on a nominal line capable of responding to such a demand.
As a result of repeating the test, the present invention has been achieved,
Without increasing the weight of the entire wire and the material used,
Compared to the conventional three strands, it has better compressive strength,
It is intended to provide here a nominal wire that can be pushed farther into.

[0006]

Means for Solving the Problems The structure of the nominal line according to the present invention, which has been adopted to achieve the object, will be described with reference to the reference numerals used in the embodiments. The rectangular synthetic resin wire 1 is stretched and twisted to give a spiral ridge 2 on the outer surface.

In the second configuration, a synthetic resin wire 1 having a cross-sectional shape including a polygon is formed, and is stretched and twisted to form a spiral ridge 2 on the outer surface. The wire L has a configuration in which a part of the wire L has a wider or narrower change in the interval in the axial direction of the spiral ridge line 2 as compared with other wire parts.

Further, the third configuration is intended for a synthetic resin wire 1 having a cross-sectional shape including a polygon, which is stretched and twisted to form a spiral ridge 2 on the outer surface. The wire L is configured such that a part of the wire L is formed in a finer line shape than other wire portions.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is configured as described above. In the first embodiment, the cross section of the synthetic resin wire 1 is substantially regular polygon. In the implementation of the regular polygon, it can be implemented as a substantially regular triangle, regular square or regular pentagon.

In the implementation of the second configuration, the wide and narrow portions of the helical ridge line 2 are changed only at one end portion of the wire L or only at both end portions.
The predetermined length portion can be implemented as one in which the interval of the spiral screw state is narrower than the other portions, that is, one in which the number of twists is increased.

Further, in the implementation of the third configuration, only a predetermined length portion on one end side of the wire L
Alternatively, only a predetermined length portion at both end sides can be implemented such that the cross-sectional area of the wire L is reduced, that is, a thin line. Furthermore, the present invention can be implemented assuming that the number of twists in the thinned portion is larger than the number of twists in the other portions.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are views showing a first embodiment of the present invention. FIG. 1 is an enlarged perspective view showing the appearance of a nominal line, and FIG. FIG. 3 is an explanatory view showing a mounted state of a tip metal fitting and the like.

Thus, the synthetic resin wire 1 according to this embodiment
Extrudes a polyester resin from a die of a resin extruder with an equilateral triangle or an equilateral triangle with rounded vertices.
This is a polyester resin wire rod that is naturally cooled or forcibly cooled and then wound around a drum or the like after being stretched in the axial direction to a required magnification, and unreeled from a drum or the like in a separate process, while passing through a heating booth. Or, while heating, for example, 20 times, 25 times, 30 times, 35 times per meter
, 40 times, 50 times, 60 times or 70 times, etc., and the shape is heated and shaped, and three spirals are formed by the twist of the linear ridges formed by the respective tops 11 of the triangle. A spiral wire L in which the ridge lines 2 are formed on the outer surface of the wire.

The spiral wire L formed in this manner, the so-called nominal line in the present invention, has an end face having a regular triangular linear cross section as shown in FIG. A wide area f surrounded by the imaginary line circle d that is in contact with the wire rod L is continuous over the entire length of the wire L, and the compressive force in the axial direction can be borne by the wide area f. Therefore, a wire having excellent compression resistance and traction resistance can be obtained, and at the same time, the spiral ridges 2 formed by the tops 11 of the triangle support the load of the wire itself by point contact, thereby protecting the cable. The contact resistance with the tube is reduced to a minimum, and it can be used as a wire with low frictional resistance.

To commercialize this, as shown in FIG. 3, one end of the spiral wire L has a hole h for connecting a cable such as an electric wire drawn into a pipe or a telephone line. Is connected to the distal end portion of the flexible wire Y by the cylindrical connection fitting S. In this way, a so-called product line is completed. The connection of the tip fittings G and the like is not limited to only one end of the wire L,
May be implemented as being connected to both ends.
Further, only the tip guide fitting G may be directly connected to the wire L.

In manufacturing the wire L, the wire 1 having a triangular cross section is used as described above for 20, 25, 30, 30, 35, 40, and 50 times per meter.
, 60 and 70 torsional rotations were applied, respectively, to produce various wire rods in which the unit interval of the spiral ridge lines 2 was changed widely and narrowly, and various tests were performed. As a result, it was confirmed that there was almost no difference in the compressive strength and the tensile strength in the axial direction between the wires. On the other hand, samples each cut to a length of 20 cm were prepared and a bending test was also performed. In this deflection test,
No noticeable difference was observed when the number of twists was 20, 25, or 30. However, when the number of twists was 35 or more, particularly 50 or more, the flexibility increased almost in proportion to the increase in the number of twists. I was able to make sure.

FIGS. 4 to 6 show the end face shapes of the wire material 1 of another embodiment. FIG. 4 shows a substantially square shape, and FIG. 5 shows a substantially pentagonal shape. 6 is a substantially regular hexagon. Therefore,
The spiral wire L formed by these wire materials 1 according to the above-described embodiment has four spiral ridges, five spiral ridges, and six spiral ridges.

FIG. 7 shows an embodiment relating to the second configuration. The wire L shown in this embodiment has a structure in which one end side (left side in the figure) has a normal spiral number portion A. The structure has a structure in which a multi-spiral portion C in which the spiral interval becomes a predetermined small interval is formed through a portion B in which the number of spirals per unit length gradually increases (a portion in which the spiral interval becomes narrower). By forming a multi-spiral portion C having a predetermined small spiral interval on one end side of the wire L by a predetermined length, the distal end of the wire L can be connected without connecting the conventional flexible wire Y to the distal end of the wire L. Can easily bend along the bend of the cable protection tube, and a wire having the required flexibility can be obtained. Needless to say again, such a portion may be formed also on the other end side of the wire L. If necessary, the conventionally used flexible wire Y may be connected to the distal end thereof.

FIG. 8 shows an embodiment relating to the third configuration. In the wire L shown in the embodiment, one end portion has a wire diameter gradually smaller than that of a normal wire diameter portion A. The structure has a structure in which a portion C having a predetermined thin wire diameter is formed by a required length through a portion B that becomes thinner. in this way,
By forming the portion C having a reduced wire diameter at one end of the wire L, the tip can be easily bent without connecting the conventional flexible wire Y to the tip of the wire L as described above. Thus, it is possible to obtain a wire having an appropriate property.

In the embodiment shown in FIG. 9, one end portion of a wire L is formed by a portion C having a smaller wire diameter than a normal wire diameter portion A.
And the number of twists per unit length of the small diameter portion is made larger than the number of twists of the normal wire diameter portion A. By doing so,
It is possible to obtain a wire having an appropriate flexibility by easily bending the distal end of the wire L.

The processing for partially reducing the wire diameter as shown in the embodiments of FIGS. 8 and 9 may be performed in an independent processing step, and a twist rotation is applied to the resin wire provided with the heating device. Although it can be carried out during the process, it can also be carried out by increasing the amount of stretching by the required length for each required time during the stretching process of the wire.

Although the resin material of the wire is not particularly limited, the polyester resin described above is preferable because it is less deteriorated with time, is excellent in pressure resistance and elongation resistance, and is excellent in toughness and flexibility. , PP, PE and the like are also non-chlorine resins and are preferable in that they have the above-mentioned properties.

Although the embodiments which are considered to be representative of the present invention have been described above, the present invention is not necessarily limited to only the structures shown in these embodiments, but includes the above-mentioned constituent elements of the present invention. In addition, the present invention achieves the object of the present invention, and can be implemented with appropriate modifications within a range having the following effects.

[0024]

As is clear from the above description, the nominal line of the first configuration according to the present invention is obtained by stretching a synthetic resin wire having a polygonal cross section and applying a twist rotation to the outer surface. Because it is configured to form a spiral ridgeline,
A wide area f surrounded by a virtual line circle d that is in contact with the midpoint of each side of the wire is continuous over the entire length of the wire L, and can bear the compressive force and the tensile force in the axial direction. There is a remarkable effect that it is possible to obtain a nominal wire which is lightweight, easy to use, and extremely excellent in compression resistance and traction resistance without increasing the amount of wire used.

The nominal line of the second configuration is, as described above, a part of the wire having the spiral ridge formed on the outer surface, and the gap between the spiral ridge in the axial direction as compared with the other wire parts. In this configuration, the end is formed at the end of the wire, so that another end can be connected to the end of the cable protection tube without connecting another member to the end. It is possible to obtain a wire rod that is easy to bend along the line and has the required flexibility, and it is possible to avoid a situation in which the connection fitting of the flexible wire becomes a resistance in the pipe, thereby enabling a smooth operation. Has an effect.

As described above, the nominal line of the third configuration has a portion formed in a part of a wire having a spiral ridge on the outer surface, the portion being formed in a finer line shape than the other wire portions. Therefore, similar to the second configuration, the distal end portion is easily bent along the bend of the cable protection tube without connecting another member to the distal end portion, and has a required flexibility. This has the effect that a smooth wire can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a wire rod showing a first embodiment of the present invention.

FIG. 2 is an enlarged end view of a wire material.

FIG. 3 is a side view showing a state where another member is connected to the distal end.

FIG. 4 is an enlarged end view showing a wire material according to another embodiment.

FIG. 5 is an enlarged end view showing a wire material of another embodiment.

FIG. 6 is an enlarged end view showing a wire material according to still another embodiment.

FIG. 7 is a side view of a main part showing another embodiment of the wire rod.

FIG. 8 is a side view of a main part showing another embodiment of the wire rod.

FIG. 9 is a side view of a main part showing still another embodiment of the wire rod.

FIG. 10 is an enlarged end view of a conventional wire rod.

FIG. 11 is an explanatory view of a conventional wire rod in a state corresponding to FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Synthetic resin wire 2 Spiral ridgeline L Wire

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[Procedure amendment]

[Submission date] November 22, 1999 (1999.11.
22)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

3. A wire (L) obtained by subjecting a synthetic resin wire (1) having a cross-sectional shape including a polygon to a drawing process, applying a twisting rotation to form a spiral ridge (2) on an outer surface, And the wire rod
A nominal line in which a part of (L) has a wider or narrower change in the interval in the axial direction of the spiral ridge (2) than the other part.

4. A change-conferring part of wide and narrow of the helical ridge (2) is a one end portion or both end portions of the wire (L),
4. The nominal line according to claim 3 , wherein the interval is smaller than other portions.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006]

The call line to the present invention taken in order to achieve the object structure [Means for Solving the Problems], referring to the code used in Example, the first configuration is substantially the cross-sectional shape positive polygon synthetic resin wire rod 1 by stretching, in which the structure is formed with helical ridge 2 on the outer surface by applying a twist rotation.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008] As an embodiment of these wires, a synthetic resin wire 1 having an irregular cross section including a polygon is stretched and twisted to form a spiral ridge 2 on the outer surface. a the wire L, and, to that part of該線material L is formed in a thin line shape than the other wire portion
Can be implemented .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

Further, in the implementation of these structures, the cross-sectional area of the wire L is reduced only at a predetermined length at one end or only at a predetermined length at both ends. That is, it can be carried out so as to form a thin line. Furthermore, the present invention can be implemented assuming that the number of twists in the thinned portion is larger than the number of twists in the other portions.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0019

[Correction method] Change

[Correction contents]

FIG. 8 shows another embodiment. In the wire L shown in this embodiment, the one end portion has a portion where the wire diameter gradually becomes smaller than the normal wire diameter portion A. This is a structure in which a portion C having a predetermined thin wire diameter through B is formed with a required length. In this manner, by forming the portion C having a reduced wire diameter on one end side of the wire L, the conventional flexible wire Y is attached to the distal end of the wire L in the same manner as described above.
Without connecting them, it is possible to obtain a wire having a required flexibility with its tip portion being easily bent.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction contents]

[0024]

From the above description, as already apparent, according to the present invention, the first configuration of the call line according to the present invention, the cross-sectional shape by stretching the substantially equilateral polygonal synthetic resin wire rod, by applying a twist rotation Since the spiral ridge line is formed on the outer surface, a wide area f surrounded by an imaginary line circle d that is in contact with the midpoint of each side of the wire is continuous over the entire length of the wire L. Since it can bear the compressive force and the tensile force in the axial direction, it is lightweight and easy to use without increasing the amount of wire used, and it has excellent resistance to compression and traction. There is a remarkable effect that can be obtained.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction contents]

[0026] As in the the implementation, a portion of the wire forming the spiral ridge on the outer surface, carried out as having a portion which is formed on the thin line-shaped than the other wire portion
In this case, like the second configuration, the distal end portion is easily bent along the bend of the cable protection tube without connecting another member to the distal end portion, and has the required flexibility. Can be obtained.

Claims (7)

[Claims] A synthetic resin wire (1) having a polygonal cross section is stretched and twisted to give a spiral ridge (2) on the outer surface.
Nominal line formed. 2. The nominal wire according to claim 1, wherein the synthetic resin wire (1) is a substantially regular polygonal wire. 3. The nominal wire according to claim 1, wherein the synthetic resin wire (1) is a substantially equilateral triangular wire. 4. A wire (L) in which a synthetic resin wire (1) having a cross-sectional shape including a polygon is subjected to a stretching treatment and a spiral ridge (2) is formed on an outer surface by applying a twist rotation, And the wire rod
A nominal line in which a part of (L) has a wider or narrower change in the interval in the axial direction of the spiral ridge (2) than the other part. 5. A wide or narrow change applying portion of the spiral ridge line (2) is one end portion or both end portions of a wire (L),
5. The nominal line according to claim 4, wherein the interval is smaller than other portions. 6. A wire (L) in which a synthetic resin wire (1) having a cross-sectional shape including a polygon is subjected to a stretching treatment, and a spiral ridge (2) is formed on an outer surface by applying a torsional rotation, And the wire rod
Nominal line in which part of (L) is formed in a thinner line than other wire parts. 7. The nominal wire according to claim 6, wherein the thin linear portion of the wire (L) is one end or both ends of the wire (L).