JP2992184B2 - Insulated operating rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated operating rod used for a charging section such as a power circuit breaker.

[0002]

2. Description of the Related Art FIG.
FIG. 4 is a front view showing a partly broken structure of a conventional insulating operation rod for a circuit breaker disclosed in Japanese Unexamined Patent Application Publication No. 4 (Kokai) 4; In the drawing, reference numeral 1 denotes an insulating rod having female threads 1a at both ends, which is formed by processing an insulating material such as glass fiber reinforced plastic. A stud 2 is screwed into the female screw 1a.
Reference numeral 3 denotes a cap nut which is tightened while fitting the circumferential projection 3a to the insulating rod 1. The insulating rod 1 is used to prevent loosening of the tightening.
Contact surface with stud 2 and insulating rod 1 and cap nut 3
The contact surface is fixed with an adhesive.

The insulated operating rod is subjected to not only a load in the axial direction but also a load in the bending direction depending on a use condition. The axial load is borne by the thread. Since the protrusion 3a of the cap nut 3 can prevent cracking at the end of the insulating rod 1 against the load in the bending direction, the above-described configuration allows the insulating operation rod to be strong against the bending load. Obtainable.

[0004]

A conventional insulated operating rod has been constructed as described above. As electric devices have higher voltages and higher capacities, the load borne by the insulating operating rods has also increased. In a conventional configuration, the strength against an axial load depends on the thread of the stud. The insulating rods and studs and the insulating rods and the cap nuts are fixed with an adhesive, but their main purpose is to prevent loosening and is not expected to increase the strength in the axial direction. This is because if the temperature changes are repeated due to the contraction of the adhesive at the time of curing or the difference in the thermal expansion coefficient between the insulating rod, the stud, and the cap nut, the adhesive surface may peel off.
In particular, when used for electrical equipment that requires high reliability, it is dangerous to expect this adhesive strength.

[0005] Therefore, in order to increase the strength in the axial direction, it is necessary to increase the screw diameter or increase the screw length to increase the contact area of the meshing threads. Therefore, if an attempt is made to obtain an insulating operation rod having a high strength while securing the insulation performance, the overall length becomes longer or the diameter becomes larger. Therefore, since the weight increases, for example, when it is used for opening / closing an electrode of a circuit breaker, the breaking speed decreases.

[0006] The present invention has been made to solve the above problems, and has as its object to obtain an insulating operating rod having high strength.

[0007]

SUMMARY OF THE INVENTION An insulated operating rod according to the present invention has a first female screw at one end and a first male screw on the outer peripheral surface, and an insulating rod at one end. A first connection fitting having a second male screw screwed to the first female screw, having a connecting portion at the other end, and having a flange provided between the second male screw and the connecting portion; One end of the portion has a bottom surface, the connecting portion of the first connection fitting penetrates a through hole provided in the bottom surface, and the second female screw provided in the cylindrical portion is connected to the first male screw of the insulating rod. And a second connection fitting which is screwed and presses the flange of the first connection fitting at the bottom surface.

Further, a hemispherical cup-shaped shield is provided at the tip of the first connection fitting screwed into the hollow insulating rod, and the cup-shaped shield and the first connection fitting are electrically connected. I do. If the insulating rod is a solid type, the shape of the bottom end of the female thread hole of the insulating rod is made hemispherical, and the hemispherical concave surface is coated with a conductive substance, and the coated part and the first connection fitting are electrically connected. Connection.

The first connection fitting has a second external thread on the outer peripheral surface of the second cylindrical portion provided at one end thereof, the second external thread being screwed with the first internal thread of the insulating rod. A second cylindrical portion having a length equivalent to at least three threads of the second male screw from one end of the cylindrical portion is formed to a thickness substantially equal to the rigidity of the insulating rod, and the other portion of the second male screw is formed. The thickness of the second cylindrical portion is higher than the rigidity of the insulating rod.

[0010] Further, a through hole through which a connecting portion of the first connection fitting penetrates is provided at one end, and a second female screw on the inner peripheral surface of the third cylindrical portion at the other end is provided with the first female thread of the insulating rod. There is provided a second connection fitting which is screwed with the male screw and presses the flange of the first connection fitting at the bottom surface at one end. Then, the third cylindrical portion having a length of at least three threads of the second female screw from the end of the third cylindrical portion of the second connection fitting has a thickness that is substantially equal to the rigidity of the insulating rod. The other portion of the second female screw has a thickness higher than the rigidity of the insulating rod.

The first connection fitting has a second external thread on the outer peripheral surface of the second cylindrical portion provided at one end thereof, the second external thread being screwed with the first female thread of the insulating rod. The thickness of the second cylindrical portion is set so that the rigidity of the second cylindrical portion is lower than the rigidity of the insulating rod at least from one end of the cylindrical portion to the length of three threads of the second external thread. The first point is set, and the thickness of the second cylindrical portion at which the rigidity of the second cylindrical portion is higher than the rigidity of the insulating rod at a position at least three threads of the second external thread is set. A second point is set, and the inner surface of the second cylindrical portion is formed in a tapered shape connecting the first point and the second point.

Further, a through-hole through which a connecting portion of the first connection fitting penetrates is provided on the bottom surface of the third cylindrical portion at one end of the second connection fitting, and the inside of the third cylindrical portion at the other end is provided. The second female screw on the peripheral surface is screwed with the first male screw of the insulating rod to press the flange of the first connection fitting at the bottom surface of one end. And
The rigidity of the third cylindrical portion is lower than the rigidity of the insulating rod at a position from the end of the third cylindrical portion of the second fitting to at least the length of three threads of the second female screw. A first point having the thickness of the cylindrical portion of No. 3 is set, and the rigidity of the third cylindrical portion is higher than the rigidity of the insulating rod at a length of three threads or more of the second female screw. A second point, which is the thickness of the third cylindrical portion,
The outer peripheral surface of the second connection fitting is formed in a tapered shape connecting the first point and the second point.

Further, from one end of the second cylindrical portion of the first fitting to at least a portion exceeding three threads of the second external thread, one end of the second cylindrical portion to the other end thereof. A slit is provided in the direction.

Further, a slit is provided from the end of the third cylindrical portion of the second connection fitting to at least a portion which exceeds the length of three threads of the second female screw.

The first connection fitting has a second external thread screwed to the first internal thread of the insulating rod on the outer peripheral surface of one end of the first cylindrical body constituting the second cylindrical portion. A first cylindrical body having at least three threads of a second external thread formed at one end of the first cylindrical body;
And a second cylinder made of a material having a smaller elastic coefficient than that of the first cylinder.

Further, the second connection fitting has a through hole in a bottom surface provided at one end of the first cylindrical body constituting the third cylindrical portion, and the through hole is connected to the connecting portion of the first connection fitting. Penetrates, and the second female screw provided on the inner peripheral surface of the first cylindrical body is screwed with the first male screw of the insulating rod to press the flange of the first connection fitting at the bottom surface, and A second cylindrical body made of a material having a smaller elastic coefficient than the first cylindrical body in which at least three threads of the second female screw are formed is fixed to the other end of the cylindrical body.

The first connection fitting has a second external thread on the outer peripheral surface of the second cylindrical portion provided at one end thereof, the second external thread being screwed with the first female thread of the insulating rod. A flange is provided between the provided connecting portion and the second male screw, the flange being in contact with the end surface of the insulating rod from the inner peripheral surface of the insulating rod to a location approximately half the thickness. Furthermore, the second connection fitting has a through hole in the bottom surface provided at one end of the third tubular part, and the connection part of the first connection fitting penetrates the through hole, and the third tubular part has a through hole. A second female screw provided on the inner peripheral surface is screwed with the first male screw of the insulating rod to press the first connection fitting at the first contact portion on the bottom surface, and to press the second fitting on the bottom surface. The contact portion comes into contact with the end face of the insulating rod up to a location approximately half the thickness from the outer peripheral surface of the insulating rod.

Further, the second connection fitting has a through hole in the bottom surface provided at one end of the third cylindrical part, and the connection part of the first connection fitting penetrates the through hole, and the third cylinder has a third cylindrical part. A second female screw provided on the inner peripheral surface of the shaped part is screwed with the first male screw of the insulating rod and presses the flange of the first connection fitting on the bottom surface, so that the elastic coefficient is higher than that of the first connection fitting. It is made of high material.

Also, the flange of the first connection fitting and the bottom surface of the second connection fitting are mechanically fixed by fixing means.

Further, the screw-in depth of the first male screw of the insulating rod and the second female screw of the second connection fitting, and the first female screw of the insulating rod and the second male screw of the first connection fitting are provided. Is different from the screwing depth.

Further, a convex curved surface is formed on the inner peripheral surface of the second cylindrical portion which exceeds at least three threads of the second external thread from one end of the second cylindrical portion of the first connection fitting. A shield body having a head is attached so that the head projects from an end of the first connection fitting.

[0022]

The insulating operating rod according to the present invention includes a first female screw of the insulating rod and a second male screw of the first connection fitting, and the first male screw of the insulating rod is connected to the second male screw of the insulating rod. The second female screw of the metal fitting is screwed together, and the flange of the first metal fitting is pressed on the bottom surface of the second metal fitting. The load is applied between the first female screw and the second male screw of the first fitting, and between the first male screw of the insulating rod and the second female thread of the second fitting.

Further, a second cylindrical portion having a length of at least three threads of the second external thread from one end of the second cylindrical portion of the first connection fitting is set to be substantially the same as the rigidity of the insulating rod. Since the thickness is set to be as small as possible, the variation in the load sharing ratio of the screw portion is reduced.

The third cylindrical portion having a length of at least three threads of the second female thread from the other end of the third cylindrical portion of the second connection fitting is substantially equal to the rigidity of the insulating rod. , The variation in the load sharing ratio of the screw portion is reduced.

Further, the rigidity of the second cylindrical portion is from the one end of the second cylindrical portion of the first connection fitting to at least three threads of the second external thread, and the rigidity of the insulating rod is A first point having a lower thickness of the second cylindrical portion is set, and the rigidity of the second cylindrical portion is set to be equal to or more than three threads of the second external thread. A second point having a thickness of the second cylindrical portion that is higher than the rigidity of the second cylindrical portion is set, and the inner surface of the second cylindrical portion has a tapered shape connecting the first point and the second point. Therefore, the variation in the load sharing ratio of the screw portion is reduced.

Further, since the outer peripheral surface of the third cylindrical portion of the second connection fitting is tapered, the load sharing ratio of the screw portion is reduced.

Also, from one end of the second cylindrical portion of the first connection fitting to one end of the second cylindrical portion to at least a portion exceeding the length of three threads of the second external thread, from the one end of the second cylindrical portion to the other end. Since the slits are provided, the variation in the load sharing ratio of the screw portion is reduced.

Also, from the other end of the third cylindrical portion of the second connection fitting to one end from the other end of the third cylindrical portion to at least a portion exceeding the length of three threads of the second female screw. , The variation in the load sharing ratio of the threaded portion is reduced.

Also, a first cylindrical body having at one end a second male screw for screwing the second cylindrical portion of the first connection fitting with the first female screw of the insulating rod; The first cylindrical body is fixed to one end of the first cylindrical body and is formed of a material having a smaller elastic coefficient than the first cylindrical body in which at least three threads of the second external thread are formed. Of the load sharing ratio of the above becomes small.

Further, the third tubular portion of the second connection fitting is
A first cylindrical body having a through hole at one end through which a connection portion of the first connection fitting penetrates, and a second female screw formed on an inner peripheral surface thereof to be screwed with the first male screw of the insulating rod; A second cylinder made of a material having a smaller elastic coefficient than the first cylinder fixed to the first cylinder, and at least a second cylinder from the end to the second cylinder.
Since the three threads of the female screw are formed, the variation in the load sharing ratio of the screw portion is reduced.

Since the flange of the first connection fitting and the bottom surface of the second connection fitting abut each other to substantially half the thickness of the end face of the insulating rod, the transmission from the insulating rod to each connecting fitting is performed. Of the applied load sharing ratio is reduced.

Further, since the third cylindrical portion of the second connecting member is made of a material having a higher elastic coefficient than the second cylindrical portion of the first connecting member, bending deformation of the second connecting member can be prevented. Can be suppressed. For this reason, the variation in the load sharing ratio transmitted to each connection fitting is reduced.

Further, since the flange of the first connection fitting and the bottom surface of the second connection fitting are fixed by the fixing means, the thickness of the bottom surface has a bending rigidity substantially equal to the combined thickness of the bottom surface and the flange. . For this reason, since the bending deformation of the bottom surface of the second connection fitting is suppressed, the variation in the load sharing ratio of each connection fitting is reduced.

[0034] The screwing depth of the first male screw of the insulating rod and the second female screw of the second connection fitting, and the first thread of the insulating rod.
Since the female screw and the second male screw of the first connection fitting have different screwing depths, the stress concentration positions between both connection fittings and the insulating rod are dispersed.

[0035]

【Example】

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of this embodiment. In the figure, 4
Is an insulating rod formed by impregnating a thermosetting resin into glass fiber and molding it into a cylindrical shape, for example. A female screw 4a is provided on the inner peripheral surface at both ends, and a male screw 4b is provided on the outer peripheral surface.
Reference numerals 5 and 6 denote connecting fittings. The connecting fitting 5 on the left side in the figure has a male screw 5a screwed into the female screw 4a of the insulating rod 4 at one end to form a hemispherical end, and the other end has a connecting part. 5b, and a flange 5c for contacting the insulating rod 4 is provided between them.

The connection fitting 6 on the right side of the drawing has a male screw 6a screwed to the insulating rod 4, a flange 6b abutting on the end face of the insulating rod 4, and a female screw 6c at the axis. Is attached. Reference numeral 8 denotes a connection fitting having a through hole 8c in a bottom surface 8b at one end of the cylindrical portion 8a, and a female screw 8d is formed on an inner peripheral surface of the cylindrical portion 8a. The connection fitting 8 is a female screw 8
d is screwed into the external thread 4b of the insulating rod 4, and the connection fittings 5, 6
Are pressed against the flanges 5c and 6b. Reference numeral 9 denotes a nut for preventing the coupling body 7 from being loosened.

In the above configuration, since the connection fittings 5 and 6 have the same operation, the description will be made using the symbols on the connection fitting 5 side. The insulating rod 4 and the connection fitting 5 are connected by a female screw 4a and a male screw 5a, and the insulating rod 4 and the connection fitting 8 are connected by a male screw 4b and a female screw 8d.
Connected by Then, the bottom surface 8b of the connection fitting 8
Presses the flange 5c of the connection fitting 5, so that when an axial tensile load is applied to the insulating operation rod, the load is shared by the respective connection portions of the connection fitting 5 and the connection fitting 8.

That is, since the screw 4a and the male screw 4b are effectively applied to the load in the axial direction because they are applied to both ends of the insulating rod 4, the screw length of the joint is the same as that of the conventional insulated operating rod. In addition, the load applied to each thread portion of the insulating rod 4 is reduced to about half, and the strength of the thread portion, which is a weak point in strength against the tensile load in the axial direction of the insulating operation rod, is greatly improved. Therefore, by applying the present invention, the axial strength is increased about twice with the same screw length as before without increasing the length of the screw portion (without increasing the overall length of the insulating operation rod).

In this embodiment, the insulating rods 4 of the connection fittings 5 and 6 are used.
Is formed in a substantially hemispherical shape, thereby reducing the electric field strength at the ends of the connection fittings 5 and 6 when a voltage is applied to both ends of the insulated operating rod. Can be further reduced in the axial direction.

In the state where the insulating operation rod is assembled as shown in FIG. 1, the positions of the tips of the external threads of the connection fittings 5 and 6 (part A) and the positions of the tips of the internal threads of the connection fitting 8 (part B) are shown. The length of each screw is determined so as to be shifted. When a load is applied to the insulator 4, stress concentrates at the screw tip position. Therefore, when the screw tip positions are the same, the stress concentration positions of the male screw and the female screw overlap, and the shear strength of the screw portion is not problematic. The insulation rod may be broken. Therefore, by adopting a configuration as shown in the figure, the stress concentration portions can be dispersed, and a decrease in strength due to stress concentration can be avoided.

In this embodiment, the diameter of the insulating rod 4 is smaller at the center portion than at the threaded portions at both ends. If the diameter is the same, the thread is weaker than the center because the thread has the above-mentioned stress concentration and is substantially smaller in diameter due to threading. The diameter of the central part is reduced to reduce the diameter.

In this embodiment, the connecting rod 6 is provided with the threaded rod 7 implanted therein. The length of the insulating rod is made variable to improve the workability when assembling the apparatus. . If there is no need for dimensional adjustment, the connection fitting 6 may have the same shape as the left connection fitting 5.

Embodiment 2 FIG. FIG. 2 is a sectional view showing another embodiment. In the figure, reference numeral 10 denotes an insulating rod having a female thread 10a and a male thread 10b formed at its ends.
Is provided. 11 is a connection fitting.
A screw 11b is formed on the outer peripheral surface of the cylindrical portion 11a at one end, and a connecting portion 11d is provided at the other end with the flange 11c interposed therebetween. Note that the external thread 11b of the connection fitting 11 is
The collar 11c is screwed into the female screw 10a, and the flange 11c is in contact with the end face of the insulating rod 10.

Reference numeral 12 denotes a hemispherical metal cup-shaped shield which is locked to a locking portion 10c of the insulating rod 10. Reference numeral 13 denotes a metal coil spring disposed in the cylindrical portion 11a of the connection fitting 11, which presses the shield 12 and electrically connects the connection fitting 11 and the shield 12. The flange 11c of the connection fitting 11 is pressed by the bottom surface 8b of the connection fitting 8 screwed to the male thread 10b of the insulating rod 10.

According to the present embodiment configured as described above,
Mechanically and electrically, the same effect as in the first embodiment is exhibited, and furthermore, a portion not related to the mechanical strength of the distal end portion of the connection fitting 11 is removed to reduce the weight compared to the first embodiment. Can be.

Embodiment 3 FIG. FIG. 3A is a sectional view showing another embodiment of the present invention, and FIG. 3B is a sectional view taken along the line III-I of FIG.
It is sectional drawing of the II line. Reference numeral 14 denotes a solid insulating rod, which is obtained by processing a laminated board obtained by impregnating glass fiber with a thermosetting resin and curing the resin. As in the first embodiment, a female screw 14a and a male screw 14b are provided at both ends. Fifteen
Is a connection fitting, and a groove 15b is provided in a longitudinal direction on a male screw 15a screwed with the female screw 14a of the insulating rod 14.

A spacer 16 has an inner diameter larger than the external thread 15a and an outer diameter smaller than the external thread 14b of the insulating rod 14. A groove 16a extending from the inner diameter to the outer diameter is provided on the side in contact with the insulating rod 14. Groove 15b and groove 16a
The space at the bottom of the female screw 14a of the insulating rod 14 has a structure communicating with an external space when the insulating rod 14 and the connection fitting 15 are assembled as shown in the figure. 15c is a connection part. Reference numeral 17 denotes an insulator having a dielectric constant of more than 1;
Filled in the space at the bottom of a.

The assembling method is as follows. First, a liquid insulator 17 is injected into the distal end of the female screw 14a of the insulating rod 14, and then the spacer 16 is sandwiched so that the groove 16a is on the insulating rod 14 side. Screw 15 in. At this time, the excess insulator flows out through the groove 15b of the connection fitting 15 and the groove 16a of the spacer 16. Then, after the injected insulator 17 is cured in a heating or normal temperature environment, the connection fitting 8 is fastened to the insulating rod 14.

Also in this embodiment, since the tensile load applied to the insulated operation rod is shared between the two connection fittings 8 and 15, the strength can be improved without increasing the screw length of the screw joint as compared with the conventional example. it can. Also, the insulating rod 14 of the connection fitting 15
Since the tip on the side is hemispherical, the electric field intensity can be reduced, and the axial dimension of the insulating operation rod can be reduced as in the first embodiment.

Further, by filling the space at the end of the internal thread 14a of the insulating rod 14 with the insulator 17 having a dielectric constant of more than 1, the electric field strength at the end of the connection fitting 15 is reduced. Can be further reduced in the axial direction.

Embodiment 4 FIG. FIG. 4 is a sectional view showing still another embodiment. In this embodiment, the tip of the external thread 18a of the connection fitting 18 is flat compared to the third embodiment. 1
8b is a connecting part. The bottom end of the female screw 19a of the insulating rod 19 has a hemispherical shape, and a conductive coating 20
It has been subjected to. Reference numeral 21 denotes a metal coil spring, which electrically connects the connection fitting 18 and the conductive coating 20. Other than that is the same as the third embodiment.

According to the present embodiment, the same effects as in the third embodiment can be obtained mechanically and electrically, and at the same time, the processing of the connection fitting 18 is facilitated and the weight can be reduced.

Embodiment 5 FIG. FIG. 5 is a sectional view showing another embodiment. In the figure, reference numeral 22 denotes a cylindrical insulating rod in which a female screw 22b is formed on an inner peripheral surface of a cylindrical portion 22a at an end and a screw 22c is formed on an outer peripheral surface. For example, glass fiber is impregnated with a thermosetting resin. Molded. 23 is a connection fitting.
One end side cylindrical portion 23 having a screw 23a formed on the outer peripheral surface
b, a connecting portion 23c on the other end side, and a flange 23d provided between the tubular portion 23b and the connecting portion 23c.

When the male screw 23a is screwed into the female screw 22b of the insulating rod 22, the contact portion 23e of the flange 23d is in contact with the inner peripheral surface of the insulating rod 22 from the center of the thickness of the end surface. It is like that. Further, the cylindrical portion 23b of the connection fitting 23 is formed with a thin portion 23f in which at least three ridges of the male screw 23a from the one end side have a thickness substantially equal to the rigidity of the insulating rod 22. ing.

Reference numeral 24 denotes a connection fitting which has a female screw 24a on its inner peripheral surface.
And a bottom surface 24d having a through hole 24c. The bottom surface 24 d has a contact portion 24 e contacting the end surface of the insulating rod 22 and the flange 2 of the connection fitting 23.
A contact portion 24f that comes into contact with 3d is formed. In addition,
The female screw 24a of the connection fitting 24 is
c, the connecting portion 23b of the connecting member 23 passes through the through hole 24c, the contact portion 24f presses the flange 23d of the connecting member 23, and the contact portion 24e contacts the end surface of the insulating rod 22. Abut

Further, the contact portion 24e of the connection fitting 24 is
When the female screw 24 a is screwed into the male screw 22 c of the insulating rod 22, the female screw 24 a comes into contact with the outer peripheral surface of the insulating rod 22 from the center of the thickness of the end face. The cylindrical portion 24b of the connection fitting 24 is
A thin portion 24 in which at least three threads of the internal thread 24a from the end are made thick enough to be approximately the same as the rigidity of the insulating rod 22.
g is formed. Reference numeral 25 denotes a shield having a convexly curved head portion 25a and an attachment portion 25b, which is attached to a thick portion deeper than the thin portion 23f in the tubular portion 23b of the connection fitting 23.

Next, the operation will be described. The insulating rod 22 and the connection fitting 23 are connected by a female screw 22b and a male screw 23a. The insulating rod 22 and the connection fitting 24 are connected by a male screw 22c and a female screw 24a, and the contact portion 24f of the connection fitting 24 presses the flange 23d of the connection fitting 23. Therefore, when an axial tensile load is applied to the connecting portion 23c, the load is shared by the connecting portions of the connecting fittings 23 and 24.

When the shapes of the connection fittings 5 and 8 in FIG. 1 are as shown in the explanatory view of FIG. 6 (similar to FIG. 1), the load sharing between the connection fittings 5 and the connection fittings 8 is about 8: 2. . FIG. 7 is an explanatory diagram schematically showing a state in which both connecting fittings 5 and 8 are deformed by applying a tensile load.

In FIG. 6, the flange 5c of the connection fitting 5 and the bottom surface 8b of the connection fitting 8 are deformed as shown in FIG. 7 by the force transmitted from the connection fitting 8, so that the connection fitting 8 is compared with the connection fitting 5. Deforms in the axial direction with a small force. That is, the connection fitting 8 has lower rigidity in the axial direction than the connection fitting 5. In order to suppress this bending deformation, it is effective to increase the thickness of the flange 5c of the connection fitting 5 and the bottom surface 8b of the connection fitting 8. However, there is a problem that the weight increases.

FIG. 8 shows a countermeasure for suppressing bending deformation.
(Similar to FIG. 5). That is, the heights of the flange 23c of the connection fitting 23 and the bottom surface 24d of the connection fitting 24 are reduced. Specifically, a step is provided on the bottom surface 24 d of the connection fitting 24, and the contact part 24 e contacting the insulating rod 22 and the contact part 2 contacting the flange 23 c of the connection fitting 23.
4f. In this case, the flange 23c and the contact portion 24e
It is effective to set the height at a position substantially at the center of the thickness of the end face of the insulating rod 22.

FIG. 9 is an explanatory view schematically showing a deformed state when a tensile load is applied in the configuration of FIG.
In the figure, the deformation of the flange 23c of the connection fitting 23 and the bottom surface 24d of the connection fitting 24 becomes very small as compared with the case of the shape of FIG. As a result, the rigidity in the axial direction of the two connection fittings 23 and 24 becomes substantially equal. Therefore, the load transmitted from the insulating rod 22 is transmitted equally to both the connection fittings 23 and 24.

FIG. 10 (similar to FIG. 2) is an explanatory diagram schematically showing the load sharing ratio at the threaded portion between the connection fitting 11 and the insulating rod 10. For the sake of simplicity, a load sharing ratio in the connection between the female screw 10a and the male screw 11b between the insulating rod 10 and the connection fitting 11 will be described.

Since the insulating rod is usually made of FRP or the like, it has a low elastic modulus. Further, since the connection fitting is usually made of an aluminum alloy or the like, it has a high elastic coefficient. for that reason,
Normally, the rigidity of the connection fitting is much higher than the rigidity of the insulating rod. In FIG. 10, since the rigidity is high up to the end of the connection fitting 11, the transmission of the load rapidly increases at the end of the external thread 11 b of the connection fitting 11. For this reason, the load distribution in the thread portion has a distribution shape with a very large end.

FIG. 11 shows an example of a load distribution at the threaded portion in the shape of the connection fitting 23 shown in the fifth embodiment in FIG. In this way, the thin portion 23f in which the length of at least three ridges of the male screw 23a from the end on the one end side of the cylindrical portion 23b of the connection fitting 23 has a thickness that is substantially the same as the rigidity of the insulating rod 22 is formed. With the provision, it is possible to suppress a sudden increase in load transmission at the screw end.

When the connection fitting 23 is made of aluminum and the insulating rod 22 is made of FRP, the load from the end of the threaded portion to the three threads is 3 to 5 times the load of the other threads. Therefore, by providing the thin portion 23f to lower the rigidity of the end portion of the screw portion, the load sharing ratio of the end portion of the screw portion can be reduced, so that the variation in load sharing in the screw portion is reduced. When the length of the thin portion 23f is about １ ／ or more of the entire length of the screw, the strength of the end portion is weakened. Therefore, it is preferable to set the length of three threads to か ら of the entire length of the screw.

As described above, in the fifth embodiment, since the difference in load sharing between the connection fittings 23 and 24 is reduced to reduce the variation in load sharing between the threads, the load can be transmitted efficiently. Therefore, the strength of the thread portion, which is a weak point in the strength of the insulating operation rod against the tensile load in the axial direction, could be improved.

Further, since the shield 25 is attached to a thick portion deeper than the thin portion 23f of the cylindrical portion 23b of the connection fitting 23, predetermined electrical characteristics can be obtained without affecting load sharing in the screw portion. Can be demonstrated.

Embodiment 6 FIG. FIG. 12 is a sectional view showing a main part of another embodiment. In the figure, reference numeral 26 denotes a connection fitting, and a cylindrical portion 26b on one end side having a screw 26a formed on the outer peripheral surface.
The other end of the connecting portion 26c, the cylindrical portion 26b and the connecting portion 2
6c. In addition,
The flange 26d is formed by the external thread 26a being the female thread 22b of the insulating rod 22.
When screwed in, the contact portion 26e is brought into contact with the insulating rod 22 from the inner peripheral surface to almost the center of the thickness of the end surface.

Further, the cylindrical portion 26b of the connection fitting 26
A first point is set at a position where the rigidity of the cylindrical portion 26b is lower than the rigidity of the insulating rod 22 at least at a position corresponding to at least three threads of the male screw 26a from the end. And
At least three threads of the male screw 26a, the cylindrical portion 2
The cylindrical portion 26 in which the rigidity of 6b is higher than the rigidity of the insulating rod 22
A second point is set at the position of the thickness b, and is formed in a tapered shape connecting the first point and the second point. In this case, by attaching the shield 25 to the thick portion at the back of the cylindrical portion 26b where the taper portion ends, it is possible to prevent the load from being affected by the screw portion.

As described above, the cylindrical portion 26b of the connection fitting 26
Is formed, a portion near the three threads of the external thread 26a and where the tensile rigidity of the connection fitting 26 and the insulating rod 22 is substantially the same is included, so that the difference in load sharing between the threads can be reduced. .

Embodiment 7 FIG. FIG. 13 is a sectional view showing a main part of another embodiment. In the figure, reference numeral 27 denotes a connection fitting, which comprises a cylindrical portion 27b having an internal thread 27a formed on the inner peripheral surface, and a bottom surface 27d having a through hole 27c. Bottom 27
As for d, a contact portion 27e that contacts the end face of the insulating rod 22 and a contact portion 27f that contacts the flange 26d of the connection fitting 26 are formed. The cylindrical portion 27b is formed with a thin portion 27g in which at least three ridges of the female screw 27a from the end have a thickness approximately equal to the rigidity of the insulating rod 22. A shield portion 27h formed in a curved shape is provided at the tip of the thin portion 27g.

Embodiment 8 FIG. FIG. 14 is a sectional view showing a main part of another embodiment. In the figure, reference numeral 28 denotes a connection fitting having a through hole 28c in a bottom surface 28b provided at one end of the cylindrical portion 28a, and a female screw 28d formed on an inner peripheral surface of the cylindrical portion 28a. The outer peripheral surface of the cylindrical portion 28a has a thickness at least from the end to the length of three threads of the female screw 28d, where the rigidity of the cylindrical portion 28a is lower than the rigidity of the insulating rod 22. The first point is defined as a point, and the rigidity of the cylindrical portion 28a is set to be equal to or longer than three threads of the female screw 28d.
The second point is the thickness of the cylindrical portion 28a which is higher than the rigidity of No. 2.

The shape of the outer peripheral surface of the connection fitting 28 is
It is formed in a tapered shape connecting the first point and the second point. A shield part 28 formed in a curved shape is provided at the tip of the cylindrical part 28a.
e is provided. This includes a portion near the three threads of the female screw 28d where the tensile rigidity of the connection fitting 28 and the insulating rod 22 is almost the same, so that the difference in load sharing between the threads can be reduced.

Embodiment 9 FIG. FIG. 15 is a cross-sectional view showing a main part of another embodiment, and FIG. 16 is a cross-sectional view taken along line XVI-XVI of FIG. 15 and 16, reference numeral 29 denotes a connection fitting substantially similar to the connection fitting 23 shown in FIG.
Are different in shape. That is, the connection fitting 29 is connected to the cylindrical portion 2.
A plurality of slits 29b are formed in the circumferential direction of the tip of 9a. Reference numeral 30 denotes a connection fitting substantially similar to the connection fitting 24 shown in FIG. 5, and the shape of the thin portion 24g is different. That is, the connection fitting 30 has a plurality of slits 30b formed in the circumferential direction at the tip of the cylindrical portion 30a.

By providing the slits 29b, 30b at the distal ends of the tubular portions 29a, 30a, the rigidity of the distal ends of the connecting fittings 29, 30 is reduced. Can be smaller.

Embodiment 10 FIG. FIG. 17 is a cross-sectional view showing a main part of another embodiment. In the figure, reference numeral 31 denotes a connection fitting, which is a cylindrical part 31d formed of cylindrical bodies 31a and 31b and having an external thread 31c formed thereon, a connecting part 31e provided to face the cylindrical part 31d, and a cylindrical part 31d. And a flange 31f provided between the connecting portion 31e. The elastic modulus of the material of the cylindrical body 31b is smaller than the elastic modulus of the material of the cylindrical body 31a. The two cylinders 31a and 31b are bonded with an epoxy adhesive or the like.

Reference numeral 32 denotes a shield fixed to the cylinder 31 and presses the cylinder 31b. Reference numeral 33 denotes a connection fitting,
It comprises a cylindrical portion 33c composed of a and 33b, a bottom surface 33e having a through hole 33d, and a mounting metal 33f screwed into the cylindrical body 33a to press the cylindrical body 33b. The elastic modulus of the material of the cylindrical body 33b is smaller than the elastic modulus of the material of the cylindrical body 33a. The two cylindrical bodies 33a and 33b are bonded with an epoxy adhesive or the like.

According to the above configuration, each of the connection fittings 31, 3
Since the rigidity of the distal end of the screw 3 decreases, the difference in load applied to the thread can be reduced.

Embodiment 11 FIG. FIG. 18 is a sectional view showing a main part of another embodiment. In the figure, reference numeral 34 denotes a connection fitting, which comprises a cylindrical portion 34a, a connecting portion 34b provided to face the cylindrical portion 34a, and a flange 34c provided between the cylindrical portion 34a and the connecting portion 34b. ing. A groove 3 is formed inside the cylindrical portion 34a facing the end of the female screw 22b of the insulating rod 22.
4d is provided. Further, a male screw 34e is formed on the outer peripheral surface of the cylindrical portion 34a, and a thin portion 34f in which at least three threads of the male screw 34e from the end have a thickness substantially equal to the rigidity of the insulating rod 22 is formed. Are formed.

Reference numeral 35 denotes a connection fitting which has a female thread 35a on its inner peripheral surface.
And a bottom surface 35d having a through hole 35c. The cylindrical portion 35b has a thin-walled portion 35e in which at least three threads of the internal thread 35a from the end have a thickness substantially equal to the rigidity of the insulating rod 22.
Are formed. Since the deformation of the connection fitting 34 increases, the difference in the load sharing ratio between the two connection fittings 34 and 35 can be reduced.

Embodiment 12 FIG. FIG. 19 is a sectional view showing a main part of another embodiment. In the figure, reference numeral 36 denotes a connection fitting, a cylindrical portion 36b having a screw 36a formed on the outer peripheral surface, a connecting portion 36c provided to face the cylindrical portion 36b, and a cylindrical portion 36b and a connecting portion 36c. A material having an elastic coefficient lower than that of the connection fitting 35 is used. In addition, a thin portion 36e is formed in which at least three threads of the external thread 36a from the end of the cylindrical portion 36b have a thickness substantially equal to the rigidity of the insulating rod 22. In this way, since the bending deformation of the bottom surface 35d of the connection fitting 35 can be suppressed, the difference in the load sharing ratio between the two connection fittings 35 and 36 can be reduced.

Embodiment 13 FIG. FIG. 20 is a sectional view showing a main part of another embodiment. In the figure, connection fittings 37 and 38 have substantially the same configuration as the connection fittings 35 and 36 in FIG. 19, but may be made of a material having the same elastic coefficient. Reference numeral 39 denotes a bolt screwed to the flange 37a of the connection fitting 37, and a connection fitting 38
Is pressed down and mechanically connected. As a result, the rigidity is substantially the same as the combined thickness of the flange 37a and the bottom surface 38a, so that the bending deformation of the bottom surface 38a of the connection fitting 38 can be suppressed, so that the load transmitted to both the connection fittings 37, 38 is shared. The difference in ratio can be reduced. Note that the connection between the two connection fittings 37 and 38 may be performed by other joining means such as welding.

[0083]

As described above, according to the present invention, the tensile load is shared by the two fittings screwed into the female screw and the male screw of the insulating rod, thereby improving the strength.

Further, a thin portion having a predetermined length is attached to the end of the external thread of the connection fitting screwed to the female thread of the insulating rod or the end of the female thread of the connection fitting screwed to the external thread of the insulating rod. By suppressing the transmission of the load at the screw end, it is possible to suppress a sudden increase in the load, so that the difference in the share of the load transmitted from the insulating rod to the connection fitting can be reduced.

Further, by providing a slit at the end of the connection fitting, the same effect as providing a thin portion can be expected.

Further, the cylindrical portion of the connection fitting is connected to the first cylindrical body,
The same effect as the provision of the thin-walled portion is achieved by comprising the second cylindrical body fixed to the end of the first cylindrical body and using a material having a smaller elastic coefficient than the material of the first cylindrical body. There is expected.

Further, by using a material of the connection fitting threaded to the male thread of the insulating rod having a higher elastic modulus than the material of the connection fitting threaded to the female thread of the insulating rod, Since the bending deformation of the bottom surface of the threaded connection fitting can be suppressed, the difference in the sharing ratio of the load transmitted from the insulating rod to the connection fitting can be reduced.

Further, by fixing the bottom surfaces of both connection fittings and the flanges by fixing means, bending deformation of the bottom surface of the connection fitting screwed to the male thread of the insulating rod can be suppressed, so that the transmission is transmitted to both connection fittings. The difference in the load sharing ratio can be reduced.

Further, the screwing depth of the female screw of the connection fitting screwed with the male screw of the insulating rod is different from the screwing depth of the female screw of the fitting metal screwed with the female screw of the insulating rod. This makes it possible to disperse the stress concentration positions between the connection fittings and the insulating rod.

Further, since the shield for alleviating the electric field is hollow, the weight can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3A is a sectional view showing another embodiment of the present invention, and FIG. 3B is a sectional view taken along line III-III.

FIG. 4 is a sectional view showing another embodiment of the present invention.

FIG. 5 is a sectional view showing another embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a state before a tensile load is applied to the connection fitting.

FIG. 7 is an explanatory view schematically showing a state in which a tensile load is applied to the connection fitting of FIG. 6 and the connection fitting is deformed.

FIG. 8 is an explanatory diagram in which a bending deformation countermeasure is implemented on the connection fitting.

9 is an explanatory diagram schematically showing a state in which a tensile load is applied to the connection fitting of FIG. 8 and the connection fitting is deformed.

FIG. 10 is an explanatory diagram showing a load sharing ratio at a screw portion between an insulating rod and a connection fitting.

FIG. 11 is an explanatory diagram showing a load sharing ratio at a screw portion between the insulating rod and the connection fitting when the configuration shown in FIG. 5 is used.

FIG. 12 is a sectional view showing a main part of another embodiment of the present invention.

FIG. 13 is a sectional view showing a main part of another embodiment of the present invention.

FIG. 14 is a sectional view showing a main part of another embodiment of the present invention.

FIG. 15 is a sectional view showing a main part of another embodiment of the present invention.

16 is a sectional view taken along line XVI-XVI in FIG.

FIG. 17 is a sectional view showing a main part of another embodiment of the present invention.

FIG. 18 is a sectional view showing a main part of another embodiment of the present invention.

FIG. 19 is a sectional view showing a main part of another embodiment of the present invention.

FIG. 20 is a sectional view showing a main part of another embodiment of the present invention.

FIG. 21 is a front view showing a partly broken portion of a conventional insulating operation rod.

[Explanation of symbols]

4, 10, 14, 19, 22 Insulating rod 4a, 10a, 14a, 19a, 22b Female thread 4b, 10b, 14b, 22c Male thread 5, 11, 15, 18, 23, 26, 29, 31, 3
4, 36, 37 Connection fittings 5a, 11b, 15b, 18a, 23a, 26a, 31
c, 34e, 36a Male thread 5b, 11d, 15c, 18b, 23c, 26c, 31
e, 34b, 36c Connecting parts 5c, 6b, 11c, 23d, 26d, 31f, 34
c, 36d, 37a Flanges 11a, 23b, 26b, 31d, 34a, 36b Tubular part 23f, 34f, 36e Thin part 29b Slit 31a First cylindrical body 31b Second cylindrical body 8, 24, 27, 28, 30 , 33, 35, 38 Connection fittings 8a, 24b, 27b, 28a, 33c, 35b Tubular portion 8c, 24c, 27c, 28c, 33d, 35c Through-hole 8d, 24a, 27a, 28d, 35a Female thread 24g, 27g, 35e Thin part 30b Slit 33a First cylinder 33b Second cylinder 34d Groove 25 Shield 39 Bolt (fixing means)

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masayoshi Nishizaki 8-1-1 Tsukaguchi Honcho, Amagasaki City Mitsubishi Electric Corporation Itami Works (72) Inventor Hidenori Fujii 8-1-1 Tsukaguchi Honcho Amagasaki City Mitsubishi (72) Inventor Mikio Hidaka 8-1-1 Tsukaguchi Honmachi, Amagasaki City Mitsubishi Electric Corporation Itami Works (56) References JP-A-6-203677 (JP, A) Sho 58-79819 (JP, U) Jiko 36-22948 (JP, Y1) Jiko 41-21243 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01B 17 / 56 H01H 33/42

Claims (19)

(57) [Claims] An end portion has a first female thread and an outer peripheral surface has a first female thread.
Between an insulating rod having a male screw, a second male screw having one end screwed to the first female screw of the insulating rod at one end, and a connecting portion provided at the other end and the second male screw; A first connection fitting provided with a flange, and a through hole in a bottom surface provided at one end of the cylindrical portion;
The connecting portion of the first connection fitting penetrates the through hole, and a second female screw provided in the cylindrical portion is screwed with the first male screw of the insulating rod, and the bottom surface is provided with the second male screw. An insulating operation rod comprising: a second connection fitting for pressing the flange of the first connection fitting. 2. The insulating rod is hollow, and a hemispherical cup-shaped shield is provided at the end of the second male screw side of the first connection fitting, and the first connection fitting and the shield are electrically connected. The insulated operation rod according to claim 1, wherein: 3. An insulating rod having a solid dielectric constant and a dielectric constant of 1 in a space formed at a tip end of the first female screw formed when a first connection fitting is screwed to a first female screw of the insulating rod. The insulated operation rod according to claim 1, wherein the insulating operation rod is filled with more than the insulating material. 4. The insulating rod is solid, and the tip of the first female screw hole of the insulating rod is formed in a hemispherical shape, and the hemispherical concave surface is coated with a conductive material. The insulated operation rod according to claim 1, wherein the connection fitting and the coating portion are electrically connected. 5. An insulating rod having a first female screw on an inner peripheral surface of a first cylindrical portion at an end and a first male screw on an outer peripheral surface, and a second cylindrical portion at one end. A second male screw to be screwed with the first female screw of the insulating rod is provided on an outer peripheral surface of the second cylindrical portion, and a second male screw is formed between a connecting portion provided at the other end and the second male screw. A first connection fitting having a flange therebetween, and a through hole in a bottom surface provided at one end of the third tubular portion, wherein the connection portion of the first connection fitting passes through the through hole; A second female screw provided on the inner peripheral surface of the third cylindrical portion is screwed with the first male screw of the insulating rod to press the flange of the first connection fitting at the bottom surface. An insulated operation rod including the second connection fitting. 6. An insulating rod having a first cylindrical portion at an end portion, a first female screw on an inner peripheral surface of the cylindrical portion and a first male screw on an outer peripheral surface, and a second rod at one end. A second external thread that is screwed with the first female thread of the insulating rod on the outer peripheral surface of the second cylindrical portion, and one end of the second cylindrical portion The thickness of at least three threads of the second external thread is set to a thickness that is substantially the same as the rigidity of the insulating rod, and the other portion of the second external thread is higher than the rigidity of the insulating rod. A first connection fitting having a thickness between the connecting portion provided at the other end and the second male screw, and a through hole in a bottom surface provided at one end of the third cylindrical portion; The connection portion of the first connection fitting penetrates the through hole, and the second female screw provided on the inner peripheral surface of the third cylindrical portion is connected to the first male screw of the insulating rod. Screw the first bottom on the bottom Presses the flange of the connection fitting of the second
Insulated operating rod provided with a connection fitting. 7. An insulating rod having a first cylindrical portion at an end, a first female thread on an inner peripheral surface of the first cylindrical portion, and a first external thread on an outer peripheral surface, and one end. And a second male screw having a second cylindrical portion and screwing with the first female screw of the insulating rod is connected to the second male screw.
A first connection fitting having a flange between the connection part provided at the other end and the second male screw, and
A through hole is provided on a bottom surface provided at one end of the cylindrical portion, and the connecting portion of the first connection fitting penetrates the through hole, and a through hole is provided on an inner peripheral surface of the third cylindrical portion. A second female screw is screwed with the first male screw of the insulating rod and presses the flange of the first connection fitting at the bottom surface, and at least the third female part is connected to the other end of the third cylindrical portion. The length of the three female threads of the second female thread was set to a thickness that was almost the same as the rigidity of the insulating rod, and the other portion of the second female thread was set to a thickness that was higher than the rigidity of the insulating rod. An insulating operation rod including a second connection fitting. 8. An insulating rod having a first cylindrical portion at an end portion, a first female screw on an inner peripheral surface of the cylindrical portion and a first male screw on an outer peripheral surface, and a second rod at one end. A second external thread that is screwed with the first female thread of the insulating rod on the outer peripheral surface of the second cylindrical portion, and one end of the second cylindrical portion The thickness of the second cylindrical portion is set so that the rigidity of the second cylindrical portion is lower than the rigidity of the insulating rod at least up to the length of three threads of the second external thread. 1 is set, and the rigidity of the second cylindrical portion is higher than the rigidity of the insulating rod at a position at least three threads of the second external thread.
A second point having a thickness of the cylindrical portion is set, and the second cylindrical portion is formed in a tapered shape connecting the first point and the second point, and is provided at the other end. A first connection fitting having a flange between the connecting portion and the second external thread, and a through hole in a bottom surface provided at one end of the third tubular portion, wherein the through hole is formed by the first
The connecting portion of the connecting fitting penetrates, and a second female screw provided on the inner peripheral surface of the third cylindrical portion is screwed with the first male screw of the insulating rod, and the second male screw is provided at the bottom surface. An insulating operation rod comprising: a second connection fitting for pressing the flange of the first connection fitting. 9. An insulating rod having a first cylindrical portion at an end, a first female thread on an inner peripheral surface of the first cylindrical portion, and a first external thread on an outer peripheral surface, and one end. And a second male screw having a second cylindrical portion and screwing with the first female screw of the insulating rod is connected to the second male screw.
A first connection fitting having a flange between the connection part provided at the other end and the second male screw, and
A through hole is provided on a bottom surface provided at one end of the cylindrical portion, and the connecting portion of the first connection fitting penetrates the through hole, and a through hole is provided on an inner peripheral surface of the third cylindrical portion. A second female screw is screwed with the first male screw of the insulating rod and presses the flange of the first connection fitting at the bottom surface, and at least the third female part is connected to the other end of the third cylindrical portion. A first point is set up to a thickness of the third cylindrical portion where the rigidity of the third cylindrical portion is lower than the rigidity of the insulating rod up to the length of three threads of the second female screw. And
A third cylindrical portion having a thickness equal to or greater than three threads of the second female screw, the rigidity of the third cylindrical portion being higher than the rigidity of the insulating rod. And set the third point
An insulated operation rod comprising: a cylindrical connecting portion having a tapered second connection fitting connecting the first point and the second point. 10. An insulating rod having a first cylindrical portion at an end portion, a first female screw on an inner peripheral surface of the cylindrical portion and a first external thread on an outer peripheral surface, and a second rod at one end. A second external thread that is screwed with the first female thread of the insulating rod on the outer peripheral surface of the second cylindrical portion, and one end of the second cylindrical portion A slit is provided from one end of the second cylindrical portion toward the other end to at least a position exceeding the length of three threads of the second external thread, and the connecting portion provided at the other end and A first connection fitting having a flange between the second male screw, and a through hole in a bottom surface provided at one end of the third cylindrical portion, wherein the through hole is formed by the first connection fitting of the first connection fitting; A connecting portion penetrates, and a second female screw provided on an inner peripheral surface of the third cylindrical portion is screwed with the first male screw of the insulating rod, and the first connection fitting is formed at the bottom surface. Press the above collar An insulated operation rod including the second connection fitting. 11. An insulating rod having a first cylindrical portion at an end portion, a first female thread on an inner peripheral surface of the first cylindrical portion, and a first external thread on an outer peripheral surface, and one end. And a second male screw on the outer peripheral surface of the second cylindrical portion, which is screwed to the first female screw of the insulating rod, and provided at the other end. A first connection fitting having a flange between the portion and the second external thread; and a through hole in a bottom surface provided at one end of the third tubular portion, wherein the through hole is connected to the first connection. The connecting portion of the metal fitting penetrates, and a second female screw provided on the inner peripheral surface of the third cylindrical portion is screwed with the first male screw of the insulating rod, and the first female screw is formed on the bottom surface. Presses the flange of the connecting fitting, and extends the other end of the third cylindrical portion from the other end of the third cylindrical portion to at least a portion exceeding the length of three threads of the second female screw. From one end to the other end. An insulated operating rod comprising a second connecting fitting. 12. An insulating rod having a first cylindrical portion at an end, a first female screw on an inner peripheral surface of the cylindrical portion, and a first male screw on an outer peripheral surface, and a second cylinder. An outer peripheral surface of a first cylindrical body having a cylindrical portion, a second male screw screwed with the first female screw of the insulating rod, and at least an end of the first cylindrical body at the end of the first cylindrical body; A second cylinder made of a material having a smaller elastic coefficient than the first cylinder formed with three threads of two external threads is fixed, and the second cylinder is sandwiched by the first cylinder. A first connection fitting having a flange between the connecting portion provided on the opposite side of the first male screw and the second male screw, and a through hole in a bottom surface provided at one end of the third cylindrical portion; The connection portion of the first connection fitting penetrates the hole, and a second female screw provided on the inner peripheral surface of the third cylindrical portion is screwed with the first male screw of the insulating rod. The first connection metal on the bottom surface And a second connection fitting for pressing the flange of the fitting. 13. An insulating rod having a first cylindrical portion at an end portion, a first female thread on an inner peripheral surface of the first cylindrical portion, and a first external thread on an outer peripheral surface, and one end. And a second male screw on the outer peripheral surface of the second cylindrical portion, which is screwed to the first female screw of the insulating rod, and provided at the other end. A first connection fitting having a flange between the portion and the second external thread, and a through hole in a bottom surface provided at one end of a first cylindrical body constituting a third cylindrical portion, The second connecting portion of the first connection fitting penetrates the through hole and is provided on the inner peripheral surface of the first cylindrical body.
A female screw is screwed with the first male screw of the insulating rod and presses the flange of the first connection fitting at the bottom surface, and the other end of the first cylindrical body has at least the second male screw. Female thread 3
An insulating operation rod comprising: a second connecting member to which a second cylindrical body made of a material having a smaller elastic coefficient than the first cylindrical body having the ridges is fixed. 14. An insulating rod having a first cylindrical portion at an end, a first female thread on an inner peripheral surface of the cylindrical portion and a first external thread on an outer peripheral surface, and a second rod at one end. A second male screw that is screwed with the first female screw of the insulating rod on the outer peripheral surface of the second cylindrical portion, and the other end of the second male screw is provided. A first connection fitting having a groove formed on the inner peripheral surface of the second cylindrical portion on the side, and having a flange between the connecting portion provided at the other end and the second male screw; A second through hole provided on a bottom surface provided at one end of the cylindrical portion, the connecting portion of the first connection fitting penetrating the through hole, and an inner peripheral surface of the third cylindrical portion. A second connection fitting having a female screw threadedly engaged with the first external thread of the insulating rod and pressing the flange of the first connection fitting at the bottom surface. 15. An insulating rod having a first cylindrical portion at an end, a first female screw on an inner peripheral surface of the first cylindrical portion, and a first external thread on an outer peripheral surface, and one end. And a second male screw on the outer peripheral surface of the second cylindrical portion, which is screwed to the first female screw of the insulating rod, and provided at the other end. A first connection fitting having a flange between the portion and the second external thread, the flange being in contact with an end surface of the insulating rod from the inner peripheral surface of the insulating rod to a location approximately half the thickness; and a third cylinder. A second through hole provided on the inner peripheral surface of the third tubular portion, the through portion having a through hole on a bottom surface provided at one end of the third tubular portion; A female screw is screwed with the first male screw of the insulating rod to press the first connection fitting at the first contact portion of the bottom surface, and the second contact portion of the bottom surface is formed of the second contact portion. Outside of the above insulating rod An insulated operating rod having a second connection fitting which abuts from the peripheral surface to a position having a thickness of about half. 16. An insulating rod having a first cylindrical portion at an end portion, a first female thread on an inner peripheral surface of the first cylindrical portion, and a first external thread on an outer peripheral surface, and one end. And a second male screw on the outer peripheral surface of the second cylindrical portion, which is screwed to the first female screw of the insulating rod, and provided at the other end. A first connection fitting having a flange between the portion and the second external thread; and a through hole in a bottom surface provided at one end of the third tubular portion, wherein the through hole is connected to the first connection. The connecting portion of the metal fitting penetrates, and a second female screw provided on the inner peripheral surface of the third cylindrical portion is screwed with the first male screw of the insulating rod, and the first female screw is formed on the bottom surface. And a second connection fitting made of a material having a higher elastic modulus than the first connection fitting. 17. An insulating rod having a first cylindrical portion at an end portion, a first female thread on an inner peripheral surface of the first cylindrical portion, and a first external thread on an outer peripheral surface, and one end. And a second male screw on the outer peripheral surface of the second cylindrical portion, which is screwed to the first female screw of the insulating rod, and provided at the other end. A first connection fitting having a flange between the portion and the second external thread; and a through hole in a bottom surface provided at one end of the third tubular portion, wherein the through hole is connected to the first connection. The connecting portion of the metal fitting penetrates, and a second female screw provided on the inner peripheral surface of the third cylindrical portion is screwed with the first male screw of the insulating rod, and the first female screw is formed on the bottom surface. An insulated operating rod comprising: a second connecting member for pressing the flange of the connecting member; and fixing means for mechanically fixing the bottom surface of the second connecting member and the flange of the first connecting member. . 18. The screwing depth of the first male screw of the insulating rod and the second female screw of the second connection fitting, and the second female thread of the insulating rod and the second female screw of the first connection fitting. The insulated operation rod according to any one of claims 1 to 17, wherein the screwing depth with the male screw is different. 19. A convex curved surface is formed on the inner peripheral surface of the second cylindrical portion which exceeds at least three threads of the second external thread from one end of the second cylindrical portion of the first connection fitting. The insulated operation rod according to any one of claims 5 to 18, wherein a shield body having a head is attached so that the head projects from one end of the first connection fitting.