JPH0445377Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a method for finishing the outer peripheral surface of the conductor terminal portion smoothly without unevenness after removing a portion of the insulator, for example, in the terminal treatment of inorganic insulated cables, etc. This invention relates to a conductor terminal cutting tool.

[Prior Art] Generally, inorganic insulated cables are used in places where heat resistance and environmental resistance are required, and the terminal treatment is different depending on the environment where the inorganic insulated cable is used. , glass seal method, and ceramic terminal method. By the way, although the quality of this terminal treatment is an important factor that influences the electrical insulation performance of an inorganic insulated cable, it has not always been sufficiently treated in the past. In all of these methods, a common factor that reduces the electrical insulation performance of the cable is that the outer circumferential surface of the conductor terminal portion and the inner surface of the sheath are not finished in a smooth state without unevenness.

In particular, in response to recent harsh environmental conditions,
There are many examples of terminal processing using the ceramic terminal method, but in this case, the metal on the ceramic terminal side is Fe-Ni alloy, and the metal on the inorganic insulated cable side is copper, copper alloy, stainless steel, etc. , welding or brazing, and therefore the metal surface on the terminal side and the metal surface on the cable side must be finished in a smooth state with no irregularities.

Conventionally, finishing of the outer circumferential surface of a conductor end portion of the above-mentioned inorganic insulated cable or the like has been carried out by polishing with a wire brush, wire wheel, or the like.

[Problems to be solved by the invention] However, when polishing with a wire brush, wire wheel, etc., the finish of the outer circumferential surface of the conductor terminal part tends to be incomplete, and the finish tends to vary widely depending on the operator. Further, the work requires a long time, and as a result, the electrical insulation performance of the inorganic insulated cable tends to deteriorate.

The object of the present invention is to provide a conductor end cutting tool that can solve the problems in the prior art described above.

[Means for Solving the Problems] The object of the present invention is to provide a cylindrical tool body having a hollow portion in the central axial direction into which a cable conductor end portion is inserted, and a cylindrical tool body having a hollow portion provided on the circumference of the cylindrical tool body. A cutting tool comprising a ring-shaped tool body having a plurality of slits in the axial direction, and a ring-shaped tool body rotatably incorporated into the slits of the ring-shaped tool body via a pin, and having a tapered part in the longitudinal direction of the outer surface of the tool body. a blade support arm;
a cutting blade attached near one end of the cutting blade support arm; a resilient member interposed between the cutting blade support arm and the cylindrical tool body near the other end of the cutting blade support arm; It is composed of a tool body and a restraining member fitted around the circumference of the cutting blade support arm, and when the restraining member is positioned at one end of the cutting blade support arm, it receives an elastic force from the resilient member. When the cutting edge of the cutting blade is pressed against the outer circumferential surface of the cable conductor end and the above-mentioned restraining member is positioned on the tapered part of the cutting blade support arm, the cutting blade resists the elastic force from the elastic member. This is achieved by a conductor end cutting tool whose cutting edge is spaced away from the outer circumferential surface of the cable conductor end.

[Function] According to the above-mentioned tool of the present invention, the cutting blade is separated from the outer circumferential surface of the conductor by the restraining member, and the cable conductor end portion is inserted into the hollow portion, and then the restraining member is moved to perform cutting. Release the separated state of the blades, press the cutting edge of the cutting blade against the outer circumferential surface of the conductor terminal part by the elastic member, and in this state move the tool in the longitudinal direction of the conductor terminal part while rotating in the cutting direction of the cutting blade. Then, the outer peripheral surface of the conductor terminal part is cut by the cutting blade, but here, the cutting blade receives the repulsive force from the elastic member and is always applied with a constant pressing force to the outer peripheral surface of the conductor terminal part, so that the conductor terminal part is cut by the cutting blade. The outer circumferential surface is smooth and has no irregularities.

[Example] The present invention will be explained below with reference to an example shown in the drawings. Figures 1a and b show an embodiment of the conductor end cutting tool 1 of the present invention, and Figures 2a, b and c
1 shows the parts shown in Fig. 1. In the figure, 21 is a cylindrical tool body, and a hollow part 4 is provided in the central part of the tool body in the axial direction. It is made to project to the B side end through the portion 4. Reference numeral 22 denotes a ring-shaped tool body disposed on the circumference of the cylindrical tool body 21, and three slits 5 are provided in the axial direction of the ring-shaped tool body. A pin insertion hole 7' is provided near the center of the side surface of the slit 5. Near the A side end of slit 5,
A spring insertion hole 12' is provided, and a spring receiving seat 12a is formed at the bottom of the insertion hole 12' (on the surface of the cylindrical tool body 21).
Inside each slit 5 is a cutting blade support arm 6.
is included. A pin insertion hole 7' is provided near the center of the side surface of each cutting blade support arm 6.
The cutting blade support arm 6 is held in the ring-shaped tool body 22 so as to be rotatable about the pin 7 inserted through the pin insertion holes 7' and 7''. The cutting blade support arm 6 is designed to rotate on a radial plane parallel to the axis a. 12b is a spring seat provided inside near the A side end of the cutting blade support arm 6. .
Reference numeral 13 denotes a tapered portion provided on the outside near the A side end of the cutting blade support arm 6, and this is formed so as to widen toward the A side end. 9 is a cutting blade fixed to the B side end of the cutting blade support arm 6. The cutting blade 9 consists of a portion 91 bent outward perpendicular to the axis a and a portion 92 extending substantially parallel to the axis a, with the tip 8 located at the inside of the tip of the portion 92 (on the side of the conductor terminal portion 3). The cutting blade 9 has a portion 9
1 is inserted into a hole 10 formed in the cutting blade support arm 6, and in this state is fixed to the cutting blade support arm 6 with a set screw 11. 12 is a ring-shaped tool body 2
The spring is located in the spring insertion hole 12' of No. 2 and is stored in a compressed state between the spring receiving seats 12a and 12b. Reference numeral 15 denotes a restraining ring fitted around the ring-shaped tool main body 22 and the cutting blade support arm 6.

Next, the procedure for cutting the outer circumferential surface of the conductor terminal part using the above-mentioned present example will be explained.
The restraint ring 15 is moved toward the A side. In this case, the restraining ring 15 is connected to the tapered portion 1 of the cutting blade support arm 6.
3, the cutting blade support arm 6 is pushed inward, and as a result, the cutting blade support arm 6 rotates around the pin 7, and the cutting blade 9 moves away from the center. do. Next, attach the conductor terminal part 3 to the tool 1.
It is inserted into the hollow part 4 of the cylindrical tool body 21 from the A side of the tool body 21 and protrudes to the B side. In this state, the cutting blade 9 does not come into contact with the conductor terminal portion 3. Next, the restraining ring 15 is moved toward the B side. Then, deterrence ring 1
As the cutting blade support arm 5 moves away from the tapered portion 13 of the cutting blade support arm 6, the cutting blade support arm 6 is removed by the restraining ring 15.
At the same time, the cutting blade support arm 6 receives a repulsive force from the spring 12 and moves to the pin 7.
The tip 8 of the cutting blade 9 contacts the outer circumferential surface of the conductor terminal portion 3 with a constant pressing force. Next, with the conductor end portion 3 fixed, the tool 1 is moved toward the A side while rotating in the cutting direction of the cutting blade 9, thereby cutting the outer peripheral surface of the conductor end portion 3.

Note that here, the conductor terminal portion 3 is inserted from the A side of the tool 1, and cutting is performed by moving the tool 1 to the A side (that is, moving it toward the main body side of the conductor). However, on the contrary, the conductor may be inserted from the B side of the tool 1 and then cut while being pulled out from the tool 1.

By cutting in this way, the conductor terminal portion 3
It is possible to finish the outer circumferential surface of the blade smoothly without any unevenness.The reason for this will be explained here.
2, the tip 8 of the cutting blade 9 is always pressed against the outer circumferential surface of the conductor end portion 3 with a constant force due to the lever principle. Therefore, rotating the cutting blade 9 along the outer circumferential surface of the conductor terminal part 3 fixed in this state is the same as cutting the outer circumferential surface of the conductor terminal part 3 with a cutting tool of a lathe, and the conductor terminal part This makes it possible to finish the outer circumferential surface of No. 3 smoothly without any unevenness.

[Effects of the invention] As explained above, the conductor terminal cutting tool according to the present invention has a hollow part in the central axial direction into which the cable conductor terminal part is inserted, and the conductor terminal part inserted into this hollow part. A plurality of cutting blades whose cutting edges are oriented so as to cut the outer peripheral surface of the conductor are arranged around the hollow part, and a resilient member is provided to press the cutting blades against the outer peripheral surface of the conductor terminal part. If cutting is performed using a cutting tool, the outer circumferential surface of the conductor end portion can be finished smoothly without any unevenness.

Moreover, there is no variation in the finish depending on the worker, and furthermore, it is expected that the working time will be shortened.

As a result, there are excellent effects such as not reducing the electrical insulation performance of the inorganic insulated cable.

[Brief explanation of the drawing]

The drawings show one embodiment of the conductor terminal cutting tool of the present invention, and FIG. 1a is a partial vertical sectional view of the conductor terminal cutting tool, FIG. 1b is a front view of the cutting tool, FIG. 2a is a perspective view of the restraining ring, FIG. 2b is a partially cutaway perspective view of the tool body, and FIG. 2c is a perspective view of the cutting blade support arm. 1... Conductor terminal cutting tool, 2... Tool body,
21... Cylindrical tool body, 22... Ring-shaped tool body, 3... Conductor terminal portion, 4... Hollow part, 5... Slit, 6... Cutting blade support arm, 7... Pin, 7'
and 7″...pin insertion hole, 8...point, 9...cutting blade, 10...hole, 11...set screw, 12...
Spring, 12'...Spring insertion hole, 12
a, 12b...Spring receiving seat, 13...Tapered portion, 14...Slit, 15...Suppression ring.

Claims (1)

[Scope of utility model registration request] A cylindrical tool body 21 is provided with a hollow part 4 in the central part in the axial direction into which the cable conductor terminal part 3 is inserted, and a plurality of slits 5 are provided in the axial direction on the circumference of the cylindrical tool body 21. Ring-shaped tool body 22
and a cutting blade support arm 6 rotatably incorporated into the slit 5 of the ring-shaped tool body 22 via a pin 7 and having a tapered portion 13 in the longitudinal direction of its outer surface; A cutting blade 9 attached near one end of the arm 6, and a resilient member 12 interposed in a compressed state between the cutting blade support arm 6 and the cylindrical tool body 21 near the other end of the cutting blade support arm 6. and a restraining member 15 fitted around the ring-shaped tool body 22 and the cutting blade support arm 6, and the restraining member 15 is positioned closer to one end of the cutting blade support arm 6 than the pin 7. So the elastic member 1
The cutting edge of the cutting blade 9 is pressed against the outer surface of the cable conductor terminal part 3 in response to the resilient force from 2, and the resilient member 12 is positioned by positioning the restraining member 15 on the tapered part 13 of the cutting blade support arm 6. A conductor terminal cutting tool characterized in that the cutting edge of the cutting blade 9 is separated from the outer circumferential surface of the cable conductor terminal 3 by resisting the elastic force from the conductor terminal 3.