JP2553255B2 - Coaxial cable end processing method and tool - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for processing an end of a coaxial cable for an FT type connector, which enables a plugging operation of a coaxial cable to be completed completely and surely according to a predetermined size without damaging the outer conductor. It is about the tool. More specifically, the present invention relates to a terminal processing method for a coaxial cable for an FT connector and a tool for the same, which has a small number of work steps for this kind of plugging work and can improve work efficiency.

[0002]

2. Description of the Related Art Conventionally, a coaxial cable has a structure in which an inner conductor and an outer conductor are arranged in a concentric cylindrical shape, and the inner conductor is supported by an insulator at the center of the outer conductor.

A signal in the coaxial cable transmission line is transmitted over a long distance between the inner conductor and the outer conductor, but the coaxial cable is attenuated by transmission loss, and an amplifier for compensating this attenuation is provided. Had to connect. In the coaxial cable transmission line, a distributor,
Various devices such as a branching device, a power supply device, and a multiplexer / demultiplexer are appropriately connected.

In a coaxial cable transmission line, a coaxial cable and the above-mentioned various devices, and a coaxial cable and a coaxial cable are connected by a connector (plugging) called a coaxial connector (plugging work).

In this plugging work, first, the end of the coaxial cable is cut with a tube cutter so that the outer conductor becomes a perfect circle, the dimensions are measured using a scale and a felt pen, and the outer skin at a predetermined position is marked. wear. Then, a cut is made at a predetermined position with this mark by a tube cutter.

Next, using a tube cutter and a cutter knife, the outer conductor and the insulator are cut at predetermined positions and removed together with the outer skin, and the outer skin up to the place where the cut is made is cut and peeled off with the cutter knife.

Finally, a CT tool (trade name) is attached to the cable end, rotated to remove the insulator between the inner and outer conductors, and the inner conductor is diagonally cut at a predetermined position by a nipper to complete the process.

There is also disclosed Japanese Utility Model Laid-Open No. 2-111085, in which the number of tools used is reduced and the end treatment of a coaxial cable can be performed with a single tool.

[0009]

In the conventional plugging work, the number of tools used is large and the work becomes complicated,
There was a problem that the accuracy in the unit of mm is required for dimensioning by the scale. Also, when making a cut with a tube cutter at a predetermined position on the outer skin, if the cut is too large, the outer conductor will be damaged, causing a breakage of the outer conductor, and there is a drawback that the work requires skill.

Further, even when the outer skin is peeled off with a cutter knife, the outer conductor is damaged if the cut is too much,
In addition to having the same drawbacks as described above, there are drawbacks such as the risk of cutting hands.

Further, Japanese Utility Model Application Laid-Open No. 2-111085 discloses a publication in which the number of tools to be used is reduced and the end treatment of a coaxial cable can be performed with a single tool. However, in this publication, since the blades are provided in the axial direction and the circumferential direction of the coaxial cable in cutting the outer cover, these cannot be operated at the same time, and it is impossible to simultaneously cut the outer cover and the insulator between the inner and outer conductors. However, there was a problem that the number of work processes increased.

In addition, in this publication, an additional work step is required in the end treatment of the coaxial cable, in which the inner conductor of the coaxial cable is projected to a predetermined length, and cutting of the insulator between the outer skin and the inner and outer conductors is required. There is a problem in that many working steps are required in addition to the required steps. Therefore, it takes a lot of time and labor to process the end of the coaxial cable, and the work efficiency is poor.

The present invention requires a small number of tools, and is capable of performing a plugging operation of a coaxial cable according to a predetermined size, safely, surely, easily, and without damaging the outer conductor. An object is to provide a terminal processing method and a tool therefor.

Further, according to the present invention, the working process is practically 2-1.
It is an object of the present invention to provide a coaxial cable terminal processing method and a tool therefor, which is less than that disclosed in Japanese Patent No. 11085, allows for easy terminal processing of the coaxial cable, and has high work efficiency in a short time.

[0015]

In order to solve this problem, as a method for processing the end of a coaxial cable, the end of the coaxial cable is inserted through the coaxial cable insertion hole into the end face of the cylindrical shell, and the coaxial cable is inserted. Insulation between the outer skin of the end of the coaxial cable and the inner and outer conductors by the outer cutting blade that turns the coaxial cable at the narrowed portion thinner than the diameter of the coaxial cable at the tip of the hole and the insulator cutting blade at the center of the insertion hole Cut the body and the body at the same time.

As a terminal processing tool for a coaxial cable, a cylindrical shell having a constricted portion thinner than the diameter of the coaxial cable by forming notches in both sides of the diameter in the central portion is provided.

A coaxial cable insertion hole for inserting a coaxial cable is provided from the tip end surface of the shell to the constricted portion.

In addition, by cutting the insulator between the inner and outer conductors,
An insulator cutting blade having a hole through which an inner conductor is inserted is provided on the shell at the rear end of the constricted portion so as to project into the coaxial cable insertion hole of the constricted portion.

The coaxial cable insertion hole at the tip of the constricted portion is provided with a jacket cutting blade which projects in the insertion hole direction and turns the jacket.

A holder having an outer conductor insertion hole into which an outer conductor of a coaxial cable fits is provided on the rear end surface of the constricted portion of the cylindrical shell, and a support shaft for fixing the holder to the rear end surface of the shell is provided.

An outer conductor cutting blade for turning the outer conductor is provided in the outer conductor insertion hole on the surface facing the shell of the holder so as to project in the outer conductor insertion hole direction.

Then, in order to cut the outer cover, the insulator and the outer conductor into predetermined dimensions, a stopper is provided on the insulator cutting blade and the rear end surface of the shell.

As another embodiment of the coaxial cable end processing tool, a cylindrical shell provided with an insulator cutting blade and an outer skin cutting blade and a cylindrical shell provided with an outer conductor cutting blade are separately provided.

[0024]

The notch portions 2a and 2b are formed in the central portion of the cylindrical shell 1 from both sides of the diameter to form the constricted portion 2 thinner than the diameter of the coaxial cable 4. A shell cutting blade 15 for turning a jacket 8 is provided on one side of a tip end portion of a coaxial cable insertion hole 3 into which a coaxial cable 4 provided from the central portion of the tip end surface 1a of the shell 1 to the constricted portion 2 is fitted. The inner conductor 5 of the coaxial cable 4 is inserted into the coaxial cable insertion hole 3 of the constricted portion 2.
And a drill-shaped insulator cutting blade 9 having a hole through which is inserted.

A holder 18 having an outer conductor insertion hole 19 into which the outer conductor 6 of the coaxial cable 4 is fitted is provided at the center of the rear end face 1b of the cylindrical shell 1, and three support shafts 20 are provided on the rear end face 1b. Fix with. The outer conductor insertion hole 1 of the surface 18a facing the shell 1 of the holder 18
An outer conductor cutting blade 24 for turning the outer conductor 6 as shown in FIG. 3 is provided on the side surface of the insulator 9. Equipped with 28.

In this way, the end processing tool 30 for the coaxial cable 4 is constructed, and the cutting end of the coaxial cable 4 is inserted into the coaxial cable insertion hole 3 from the tip surface 1a of the shell 1 to the stopper 17 while rotating the shell 1. Then, the outer skin 8 is cut into a predetermined size by the outer skin cutting blade 15, and the insulator 7 between the inner and outer conductors 5 and 6 is cut into a predetermined size by the drill-like insulator cutting blade 9.

The cutting end of the coaxial cable 4 obtained by cutting the outer cover 8 and the insulator 7 to a predetermined size is held by a holder 18.
The shell 1 is inserted into the outer conductor insertion hole 19 up to the stopper 28 while rotating the shell 1 as described above. Then, the outer conductor 6 is cut by the outer conductor cutting blade 24 into a predetermined shape in a turning shape.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a detailed description with reference to the accompanying drawings showing an example of the method of processing the end of a coaxial cable and the tool thereof according to the present invention.

FIG. 1 shows a coaxial cable end machining tool as viewed from the side, FIG. 2 shows one cut along the line AA in FIG. 1, and FIG. 3 shows a coaxial cable end machining tool in a holder. Shown from the side. FIG. 4 shows the one cut along the line BB in FIG. 1, and FIG. 5 shows the shell seen from the rear end face.

FIG. 6 shows the holder as viewed from the shell side, FIG. 7 shows the holder cut along the line C--C in FIG. 6, and FIG. 8 shows the coaxial cable terminal processing for attachment to the FT type connector. It is a dimensional drawing.

The cylindrical shell 1 is shown in FIG. 1, FIG. 2 and FIG.
As shown in, the constricted portion 2 is formed by forming notches 2a and 2b from both sides of the diameter in the central portion closer to the tip than the middle. These notches 2a and 2b are thinner than the diameter of a coaxial cable 4 which will be described later and are processed from both sides of the diameter, and are cut out so as to be equal to the diameter of an outer conductor 6 which will be described later to form a constricted portion 2 of a predetermined length. It was done like this.

The coaxial cable insertion hole 3 is a hole into which the coaxial cable 4 bored from the front end surface 1a of the shell 1 to the constricted portion 2 is inserted, and the rear end portion from the middle of the constricted portion 2 is inserted into this insertion hole 3 The enlarged portions 3a, 3a having a larger diameter are used.

As is well known, the coaxial cable 4 is provided with an inner conductor 5 made of copper in the center, and is arranged concentrically with an outer conductor 6 made of aluminum so that the inner conductor 5 is supported at the center of the outer conductor 6. The insulator 7 is interposed. Then, the outer periphery of the outer conductor 6 is covered with an outer skin 8 as an anticorrosion layer.

Known drill-shaped insulator cutting blades (CT mentioned above)
The tool 9 has an outer diameter that fits into the outer conductor 6 of the coaxial cable 4, and a hole 10 that fits the inner conductor 5 of the coaxial cable 4 at the center thereof. Then, the shank 12 is fixed to a rear end surface 11 of the constricted portion 2 of the shell 1 described later, and the shank 12 is fitted into the insulator 7 between the inner and outer conductors 5 and 6 of the coaxial cable 4.

The rear end surface 11 of the constricted portion 2 of the shell 1 is
A blind hole 13 into which the shank 12 of the insulator cutting blade 9 is inserted is formed in the central portion, the shank 12 of the insulator cutting blade 9 is inserted into this blind hole 13 and fixed with a set screw 14. is there. By doing so, the insulator cutting blade 9 is located at the center of the coaxial cable insertion hole 3 and the shell 1 is rotated so that the insulator 7 between the inner and outer conductors 5 and 6 is cut into a hole-like shape. It was done.

The outer skin cutting blade 15 has a cutout portion 2a of the constricted portion 2.
As shown in FIG. 1, the tip end is cut away from the other cutout portion 2b.
a Notched as an inclined surface by about 5 ° around the lower end,
The base is fixed by a set screw 16 along the inclined surface. The outer skin 8 of the coaxial cable 4 is cut in a turning shape by the blade tip portion of the outer skin cutting blade 15 which projects into the coaxial cable insertion hole 3.

The stopper 17 is provided on the insulator cutting blade 9 located at the rear end of the constricted portion 2, and may be provided integrally with the shank 12 or inserted into the shank 12. Is. This stopper 17 is used for the coaxial cable 4
The insertion length of the shell 1 from the coaxial cable insertion hole 3 of the tip end surface 1a is restricted, and the cutting length of the outer skin 8 by the outer skin cutting blade 15 and the insulator 7 between the inner and outer conductors 5, 6 by the insulator cutting blade 9 are Specify the cutting length of.

The holder 18 is of a short cylindrical shape having the same shape as the shell 1, and has an outer conductor insertion hole 19 into which the outer conductor 6 of the coaxial cable 4 is fitted, which is formed at the center. Then, the holder 18 is attached to the three support shafts 20, and the support shafts 20 are attached to the rear end surface 1b of the shell 1.
The holder 18 is fixed to the rear end surface 1b of the shell 1.

As shown in FIG. 2, the three support shafts 20 are formed with a screw 20a at one end and a screw hole 20b at the other end, respectively, and screw holes 21, 2 formed in the rear end surface 1b of the shell 1.
The screws 20a are screwed into the screws 1 and 21 and attached to the rear end face 1b of the shell 1. The support shafts are formed to have a predetermined length that determines the predetermined length of the outer conductor. The shafts 20 are attached to the holder 18 by inserting the other ends of the shafts 20 into the stepped holes 22 of the holder 18 shown in FIGS. 6 and 7 from the opposite surface 22a facing the shell 1, Set screw 2 from the other surface 22b of 22
3 is screwed in.

The outer conductor cutting blade 24 shown in FIG. 3 is fixed to the surface 18a of the holder 18 that faces the rear end surface 1b of the shell 1 with a set screw 27 as shown in FIG. The surface 18a facing the rear end surface 1b of the shell 1 is
This is an inclined surface having a slight angle (about 2 °) with the rear end surface 1b, and a step 25 as shown in FIGS. 6 and 7 is formed on one side.
To provide. Then, the outer conductor cutting blade 24 is attached to the step 25.
Along the rear end face 1b of the shell 1 so that the cutting edge projects into the outer conductor insertion hole 19 in the center.
A set screw 27 is screwed into and fixed to the screw hole 26 formed in a.

The stopper 28 cooperates with the three support shafts 20 having a predetermined length to limit the insertion degree of the inner conductor 5 obtained by cutting the insulator 7 and the outer skin 8 from the outer conductor insertion hole 19. The cutting length of the outer conductor 6 is defined. Then, as shown in FIG. 2, the screw portion 28a and the flat round head 2 which are fitted into the screw hole 29 formed at the center of the rear end face 1b of the shell 1 are inserted.
8b, the circumference of the head portion 28b is relatively notched so as to be easily rotated. The above-mentioned series is referred to as a coaxial cable end processing tool 30.

The longitudinal knurls 31 provided in the longitudinal direction of the outer peripheral portion of the shell 1 prevent slippage when the shell 1 is rotated.

Next, when using this, the cut surface of the coaxial cable 4 is made into a perfect circle by using a tube cutter (not shown) as in the conventional case. And
This cut end face is inserted into the coaxial cable insertion hole 3 of the tip end face 1a of the shell 1 up to the stopper 17 while rotating the shell 1. Then, the outer cover 8 is fixed to the tip of the constricted portion 2 having the same diameter as that of the outer conductor 6 by the outer cutting blade 15 and
As shown in, it is cut into a predetermined size in a turning shape.

At the same time, the inner and outer conductors 5 of the coaxial cable 4 are
The insulator 7 between the 6 and 6 is insulated by the insulator cutting blade 9 having the shank 12 fixed in the blind hole 13 at the center of the rear end 11 of the constricted portion 2 as shown in FIG. The body 7 is cut into a hole with a predetermined size.

The end of the coaxial cable 4 in which the outer cover 8 and the insulator 7 are cut to the predetermined size is connected to the front end face 1a of the shell 1.
Of the shell 1 through the outer conductor insertion hole 19 of the holder 18 fixed to the rear end face 1b.
Insert while rotating. At this time, the stopper 28
When inserted up to, the rear end surface 1b of the shell 1 of the holder 18
The outer conductor cutting blade 24 fixed to the surface 18a facing the outer conductor 6 cuts the outer conductor 6 into a predetermined shape as shown in FIG.

Finally, a nipper (not shown) as in the conventional case
Then, the tip of the inner conductor 5 is diagonally cut at a position of 16.5 mm as shown in FIG.

In the present invention, the insulator cutting blade 8, the outer skin cutting blade 15 and the outer conductor cutting blade 24 are provided on both sides of the front end surface 1a and the rear end surface 1b of the single cylindrical shell 1, respectively. The coaxial cable terminal processing tool 30 is used. On the other hand, one cylindrical shell 1 is provided with an insulator cutting blade 8 and an outer skin cutting blade 15, and a separate cylindrical shell is provided with an outer conductor cutting blade 24 in the same manner as described above to form an outer skin / insulator cutting tool and an outer conductor cutting tool. (Neither is shown). In this configuration, the outer skin 8 and the insulator 7 and the outer conductor 6 are not cut by the single coaxial cable terminal processing tool 30, but can be cut off separately.

[0048]

The plugging work of this kind can be carried out by using a small number of tools such as the tube cutter, the nipper and the coaxial cable terminal processing tool 30 of the present invention, and the work steps can be reduced as compared with the conventional one. , Work is easy, work is completed in a short time, and work efficiency is improved.

Further, it is not necessary to make a cut with a tube cutter at a predetermined position on the outer skin or peel the outer skin with a cutter knife, and the work can be safely carried out without damaging the hand. In addition, the outer conductor 6 is not cut and damaged, and the coaxial cable 4 is not broken even when subjected to wind, vibration, or the like.

Further, the coaxial cable terminal processing tool 3 of the present invention
By using 0, there is no need for dimensioning by a scale, accuracy in mm unit is surely obtained, and skill is not required.

[Brief description of drawings]

FIG. 1 is a side view of a coaxial cable terminal processing tool.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a rear view of the coaxial cable terminal processing tool as viewed from the holder side.

FIG. 4 is a sectional view taken along line BB of FIG. 1;

FIG. 5 is a rear view of the shell as seen from the rear end face.

FIG. 6 is a front view of the holder seen from the shell side.

FIG. 7 is a sectional view taken along line CC of FIG. 6;

FIG. 8 is a dimensional diagram showing a terminal processing dimension of a coaxial cable for attaching an FT connector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 shell 1a front end surface 1b rear end surface 2 constricted portions 2a, 2b notch portion 3 coaxial cable insertion hole 3a enlarged portion 4 coaxial cable 5 inner conductor 6 outer conductor 7 insulator 8 outer shell 9 insulator cutting blade 10 hole 11 after the constricted portion End face 12 Shank 13 Blind hole 14 Set screw 15 Outer cutting blade 16 Set screw 17 Stopper 18 Holder 19 Outer conductor insertion hole 20 Support shaft 20a Screw 20b, 21 Screw hole 22 Stepped hole 22a Surface facing the shell 22b Other surface 23 Set screw 24 Outer conductor cutting blade 25 Step 26 Screw hole 27 Set screw 28 Stopper 28a Screw portion 28b Flat round head 29 Screw hole 30 Coaxial cable end processing tool 31 Vertical knurl

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akifumi Funabiki 2-3-3, Honjo Higashi, Kita-ku, Osaka City, Osaka Prefecture Kindennai Co., Ltd. (56) Reference JP-A-61-42210 (JP, A) JP Shown 63-7912 (JP, A) Actually open 2-111085 (JP, U) Actually opened 63-40116 (JP, U) Actually opened 62-38011 (JP, U)

Claims (3)

(57) [Claims] 1. A coaxial cable is inserted into the end surface of a cylindrical shell.
Insert the end of the coaxial cable from the entry hole,
Of a cable thinner than the diameter of the coaxial cable at the tip of the insertion hole.
The outer skin cutting blade that turns the outer skin of the coaxial cable
Coaxial cable with the insulator cutting blade at the center of the insertion hole of the constriction
Simultaneously cut the outer skin of the terminal and the insulator between the inner and outer conductors.
A method for processing a terminal of a coaxial cable, which is characterized in that 2. A notch is formed in the central portion from both sides of the diameter.
Te cylindrical shell configured provided with a thin constricted portion than the diameter of the coaxial cable, the coaxial cable insertion hole to fit the coaxial cable provided over the constricted portion from the distal end surface of the shell, the inner
Cutting the insulator between the external conductor, a hole fitted to the inner conductor
A penetrating insulator cutting blade is provided on the shell at the rear end of the constricted portion so as to project into the coaxial cable insertion hole at the constricted portion, and protrudes in the coaxial cable insertion hole at the tip of the constricted portion in the insertion hole direction.
Te the envelope cutting blade which handed cutting the jacket is provided, the holder bored outer conductor insertion hole which the external conductor of the coaxial cable to the constricted portion rear end surface of the cylindrical shell is fitted is provided, the holder of the shell the support shaft is fixed to the rear end surface provided, the outer conductor cutting edge of the outer conductor insertion hole direction handed cutting the outer conductor to the external conductor insertion holes of the surface facing the the holder shell
A terminal processing tool for a coaxial cable, which is provided so as to project into a groove, and is provided with a stopper on an insulator cutting blade and a rear end surface of the shell in order to cut the outer cover, the insulator and the outer conductor to predetermined dimensions. 3. An insulator cutting blade and an outer skin cutting blade are provided.
A cylindrical shell, cylindrical shell to provide an external conductor cutting edge
3. The coaxial cable end processing tool according to claim 2, wherein and are separately provided .