JPH0743871Y2 - Bushing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a bushing device used for an electric device such as a pole transformer.

[Prior Art] The high-voltage bushing device that was conventionally used for transformers, etc.
Shown in Figures 11 and 12. In these figures, 1 is a porcelain insulator consisting of a head 1A having a circular cross section and a tubular neck lower portion 1B, 2 is a knob insulator attached to the head 1A of the porcelain insulator, and the head 1A has a An electric wire connector accommodating recess 1a opening at one end on the opposite side to the lower neck, a conductor through hole 1b having one end open at the bottom of the recess 1a, and an internal lead wire insertion hole 1c continuous to the other end of the through hole are provided. It is provided coaxially. A through conductor 3 is provided so as to penetrate through the through hole 1b, and a connection fitting 4 arranged in the recess 1a is screwed to one end of the through conductor 3. An internal lead wire 5 inserted in the insertion hole 1c is connected to the other end of the through conductor 3, and the lead wire 5 is covered with an insulating tube 6.

The connection fitting 4 has a cylindrical protrusion 4a, and the base of the protrusion
A hole for inserting the core wire 7a of the external electric wire 7 is provided in 4a1. Screw portions 4a2 and 4a3 are also provided at intervals on the protruding portion of the connection fitting. A long cutout groove 1a2 extending in the axial direction is formed in a wall portion 1a1 surrounding the recessed portion 1a of the porcelain head, and the core wires of the two external electric wires 7 and 7 introduced into the recessed portion 1a are connected through the cutout groove 1a2. It is inserted into the hole of the base portion 4a1 of the protruding portion 4a of the metal fitting 4.

An electric wire fixing nut 8 which constitutes an external electric wire connecting device together with the connecting fitting 4 is fixed in the knob insulator 2, and the fixing nut 8 is screwed to the screw portion 4a2 of the connecting fitting 4. Then, a spring washer 9 and a washer 10 are arranged between the nut 8 and the core wires 7a, 7a of the external electric wires 7, 7 so that the washer 10 and the connection fitting 4
The core wires 7a, 7a of the electric wire are sandwiched between and, the knob insulator 2 is turned by hand, and the core wires 7a, 7a of the electric wire are tightened through the washers 9 and 10 by the nut 8 to connect the external electric wire. There is. The threaded portion 4a3 of the connection fitting 4 is provided to prevent the knob insulator from coming off from the connection fitting 4 when the knob insulator 2 is rotated in the loosening direction.

[Problems to be Solved by the Invention] In the above-mentioned conventional bushing device, a long cutout groove 1a2 is provided in a wall portion surrounding the recessed portion 1a for introducing an external electric wire, and the charging portion ( Since there is a connection metal fitting 4 and its peripheral portion) and a slight gap exists between the knob insulator 2 and the inner circumference of the opening of the recess 1a, it cannot be said that the concealment of the charging portion is sufficient. Therefore, when this bushing device is used for electrical equipment installed outdoors such as pole transformers, birds peck the charging part with their beaks,
There is a problem that a ground fault accident (so-called bird damage accident) occurs when a bird holding a wire inserts the wire into the recess 1a.

Further, in the conventional bushing device, the concealment of the charging part was incomplete, so that there was a problem in safety during hot-line work.

Furthermore, in the conventional bushing device, the external lead wire is tightened by turning the insulator by hand and the variation in the tightening force becomes large. Could cause trouble.

Further, in the external electric wire connector having a structure in which the tip end portion of the core wire of the external electric wire is sandwiched and tightened, even when the core wire of the external electric wire is deformed, the core wire can be connected, so that the tip end portion of the core wire is deformed. If you use the product without noticing that it is present, there is a risk that the wire may break at a later date or that overheating may occur due to poor contact.

An object of the present invention is to eliminate the risk of causing bird damage in a bushing device provided with a porcelain bushing having an electric wire connector accommodating concave portion opened in the axial direction at one end and an external electric wire connector provided in the concave portion, It is intended to secure the safety of hot wire work, to even out the tightening force of the external electric wire, and to prevent the trouble from occurring later by not connecting the core wire when the core wire is deformed. .

[Means for Solving the Problem] In order to achieve the above object, in the present invention, two external wires having similar cross-sectional shapes to external electric wires, whose central axes are parallel to each other, and which are open on the same side. The wire insertion holes 25, 25 are provided so as to penetrate the wall portion 13A around the recessed portions of the porcelain bushings 10, 10.

The external electric wire connector 19 has two core wire guide holes 16c2, 16c2 which respectively penetrate the core wires 26a, 26a of the two external electric wires 26, 26 introduced into the recess through the two external electric wire insertion holes. The guide portion 16c, the terminal metal fitting 16 fixed to the bottom of the recess 13, and the pressing metal fitting 17 for sandwiching the core wire penetrating the core wire guide holes 16c2, 16c2 between the terminal metal fitting and the pressing metal fitting to the terminal metal fitting. And one screw means 18 for tightening.

The holding metal fitting and the terminal metal fitting each have a groove portion 17b and a protruding portion 16b which are fitted with each other, and the core wires penetrating through the two core wire guide holes are fitted on both sides of the protruding portion 16b of the terminal metal fitting, respectively. 2 terminal fitting side core wire fitting grooves 16a2,1
6a2 is provided in alignment with the two guide holes.

Two presser fitting side core wire fitting grooves 17a2, 17a2 facing the two core wire fitting grooves 16a2, 16a2 of the terminal fitting are provided on both sides of the groove of the presser fitting 17, respectively.

The opening of the recess 13 of the porcelain insulator is closed by an insulator cap 30 separated from the external electric wire connector.

The screw means may be a bolt penetrating the holding fitting and screwed into the terminal fitting, or a nut fixed to the terminal fitting and screwed into a stud bolt penetrating the holding fitting.

[Operation] As described above, instead of providing the notch groove in the wall portion around the recess for accommodating the electric wire connecting fitting of the porcelain bush, an external electric wire insertion hole having a cross-sectional shape similar to that of the external electric wire is provided and the inside of the concave portion is passed through the insertion hole. If an external electric wire is introduced into the plug and the opening of the recess is closed with an insulator cap, the gap generated near the introduction part of the external electric wire can be almost eliminated, and the charging portion can be covered by the insulator cap. Since it can be completely covered, it is possible to completely conceal the charging part, prevent the occurrence of bird damage, and ensure the safety of hot-line work.

Further, as described above, when the guide portion is provided in the external electric wire connector and the core wire of the external electric wire is inserted between the terminal metal fitting and the pressing metal fitting after passing through the guide hole of the guide portion, When the tip portion is deformed, it does not pass through the guide hole, so that the core wire cannot be connected. Therefore, it is possible to connect the core wire to the external electric wire connector only when the core wire is not deformed, and it is possible to prevent the external wire deteriorated due to the deformation of the core wire from being connected to cause poor contact or disconnection. .

Further, when the screw means for tightening the core wire of the external electric wire connector is provided separately from the insulator cap as described above, the tightening of the screw means can be performed uniformly at all times by using the torque wrench. It is possible to prevent troubles caused by the shortage.

In particular, as described above, when the external wire connector is configured by the holding metal fitting having the groove portion and the protruding portion that are fitted to each other and the terminal metal fitting, the locking of the holding metal fitting is prevented by the fitting of the groove portion and the protruding portion. Therefore, the pressing member can be tightened by one screw means without rotating, and the work of fixing the core wire can be easily performed.

In addition, if the press fitting and the terminal fitting are provided with core wire fitting grooves as described above, the core wire will not move when tightening the press fitting against the terminal fitting, and the core wire will always be attached to the terminal fitting and the press fitting. Since they are connected in the same positional relationship with each other, the electrical connection state between the core wire and the connector can be made uniform.

Further, when the external electric wire insertion hole is provided so as to be opened on the same side as described above, when two external electric wires are connected, the two external electric wires can be connected from the same side. Combined with the fact that the tightening can be easily performed with one screw means, the work of connecting the external electric wire on the pillar can be facilitated.

[Embodiment] An embodiment of the present invention will be described below with reference to the accompanying drawings.

1 to 9 show an embodiment of the present invention.
In FIG. 1, 10 is a head 11 having a circular cross section and a cylindrical neck lower part 12.
It is a porcelain insulator consisting of and. The lower neck 12 is formed with a smaller diameter than the head 11, and the outer surface of the head 11 is corrugated to increase the creeping discharge distance.

In the head portion 11 of the porcelain bushing, the electric wire connector accommodating recessed portion 13 opening at one end on the side opposite to the lower neck portion of the head portion, the conductor through hole 14 having one end opened at the bottom portion of the recessed portion 13 and the through hole An internal lead wire insertion hole 15 continuous with the other end is provided coaxially.

An electric wire connector 19 including a terminal fitting 16, a holding fitting 17, and a bolt (screw means) 18 is arranged in the recess 13.

The terminal fitting 16 has a base portion 16a, one end of which is in contact with the bottom portion of the recess 13 through the packing 20, and a recess 13 from the center of the other end of the base portion 16a.
16b protruding toward the opening side of the base plate and a flat core wire guide portion 16c located at the core wire insertion side end of the base portion 16a and extending in a direction orthogonal to the core wire insertion direction (see FIGS. 2 and 3). )
And a screw hole 16a0 opened at the other end of the base portion 16a. The other end of the base portion 16a is provided with a pair of flat surfaces 16a1 and 16a1 located on both sides of the projecting portion 16b, and the pair of flat surfaces 16a1 and 16a1 respectively has a semi-elliptical cross-sectional shape of a terminal metal fitting side core wire fitting. Grooves 16a2, 16a2 are provided. These core wire fitting grooves are provided on the same plane so as to extend parallel to each other along the core wire insertion direction, and the guide portion 16c is provided so as to be orthogonal to these core wire fitting grooves.

The holding metal fitting 17 is formed in a substantially U-shape having a groove portion 17b that fits with the protruding portion 16b of the terminal metal fitting 16, and has flat surfaces facing the pair of flat surfaces 16a1 and 16a1 at both ends of the holding metal fitting. 17a1 and 17a1 have the terminal metal fitting side core wire fitting grooves 16a2 and 16a2
Cross section of semi-circular presser fitting side facing each other
17a2 and 17a2 are provided.

Details of the holding wire side core wire fitting groove 17a2 are shown in FIGS. 6 and 7. FIG. 6 is an enlarged view of the portion A of FIG. 5 showing the holding metal fitting 17 alone, and FIG. 7 is a sectional view taken along the line BB of FIG. As is clear from these figures, the core wire fitting groove 17
Both axial end portions 17d of a2 are formed in a trumpet-like shape so as to facilitate the insertion of the core wire.

In the present embodiment, three protrusions 17e extending in the direction orthogonal to the axial direction are provided on the inner surface of the core wire fitting groove 17a2. When the core wire is tightened, the protrusions 17e bite into the core wire to increase the pull-out resistance of the external electric wire.

In addition, in the illustrated example, three protrusions 17e are provided,
It suffices that at least one protrusion is provided, and the number thereof is arbitrary.

Terminal fitting side core wire fitting groove 16a2, Holding fitting side core wire fitting groove 17a2
Size (depth and width) and core fitting groove 17 on the side of the presser fitting
The size (height) of the protrusion 17e of a2 is such that when the core wire is inserted between both grooves and the bolt 18 is tightened, the flat part 16 on the terminal fitting side is
It is set so that a1 and the flat portion 17a1 on the side of the holding metal fitting are in contact with each other, and an appropriate tightening force for the core wire and an appropriate pullout resistance of the core wire can be obtained.

In this embodiment, stoppers 16as, 16as projecting upward are provided at the outer ends of the flat portions 16a1, 16a1 of the pair of terminal fittings, and these stopper portions 16as, 16as are located on the terminal fitting side of the holding fitting 17. The holding member is prevented from being displaced or tilted with the end side surface sandwiched.

By thus providing the stoppers 16as, 16as to prevent the displacement and inclination of the pressing metal fitting 17, the displacement and inclination of the pressing metal fitting 17 which is easy to occur when only one external electric wire is connected are prevented. be able to.

Guide part 16 provided at the end of the terminal fitting on the external wire insertion side
In c, core wire guide holes 16c2, 16c2 aligned with the substantially elliptical core wire fitting holes 16a2, 16a2 on the terminal metal fitting side and the core wire fitting grooves 7a2, 17a2 on the holding metal fitting side are respectively formed. The core wire which is provided and passes through these guide holes is fitted into the core wire fitting hole.

The guide portion 16c is fixed to the terminal fitting by a driving screw (not shown) or the like.

The size of each core wire guide hole 16c2 is set to be slightly larger than the outer diameter of the core wire. Therefore, a normal core wire that has a straight shape and the wires are gathered together without loosening is the core wire guide hole.
Although it can be easily inserted into the 16c2, an abnormal core wire in which the strands are scattered, deformed or double-folded cannot easily pass through the core guide hole 16c2.

By providing the guide hole 2 in this way, the core wire that has been deformed and deteriorated is eliminated, so that it is possible to eliminate the possibility of trouble such as disconnection due to misuse of the deformed core wire.

A screw hole 16b1 is provided in the projecting portion 16b of the terminal fitting 16, and a bolt 18 penetrating a plain hole 17c provided at the end of the holding fitting is screwed into the screw hole 16b1. In the present embodiment, the bolt 18 constitutes screw means for tightening the holding metal fitting 17 with respect to the terminal metal fitting 16.

In the through hole 14 in the head portion 11 of the porcelain bushing, a through conductor 21 having a screw portion 21a at the tip and a flange portion 21b at the rear end is inserted.
The threaded portion 21a at the tip of the through conductor 21 is the screw hole 1 of the terminal fitting 16.
It is screwed into 6a0. A cushion 22 made of a press board or the like is arranged between the flange portion 21b of the through conductor and the end portion of the through hole 14, and the terminal fitting 16 is recessed 13 by tightening the screw portion 21a.
Fixed to the bottom of the.

A core wire of an internal lead wire 23 is connected to the flange portion 21b of the through conductor 21 by brazing, and the lead wire 23 is covered with an insulating tube 24.

Two external electric wire insertion holes 25, 2 penetrating the wall portion 13A surrounding the concave portion 13 of the porcelain insulator head 11 and extending in parallel with each other on the same plane.
Five are provided. These external wire insertion holes 25, 25 are coaxially aligned with the two substantially elliptical core wire fitting holes formed by the core wire fitting grooves 16a2, 16a2 and 17a2, 17a2 and the two core wire guide holes 16c2, 16c2. The external wire 26 is inserted into the recess 13 through the external wire insertion hole 25, and the core wire 26a of the external wire 26 is sandwiched between the core wire fitting grooves 16a2 and 17a2 facing each other, and one bolt 18 is tightened to fix each external wire 26. It is designed to be connected to the terminal fitting 16.

Each external electric wire insertion hole 25 has a cross-sectional shape similar to that of the external electric wire 26, and the inner diameter of each insertion hole 25 is equal to the external electric wire 26.
Is formed to have a minimum size (for example, about 1 to 2 mm larger than the diameter of the external electric wire) for inserting the wire, and care is taken so that there is almost no gap between the external electric wire 26 and the insertion hole 25. There is.

In order to facilitate the alignment of the core wire fitting grooves 16a2 and 17a2 of the terminal fitting 16 and the press fitting 17 and the core wire guide hole 16c2 with the corresponding external wire insertion hole 25 during assembly, the terminal fitting 16
It is preferable to provide a positioning means for positioning the terminal fitting 16 by means of concave-convex fitting or the like between this and a part of the inner surface of the recess 13.

The opening of the recess 13 is closed by a removable insulator cap 30. In order to attach the insulator cap, a first insulating ring 31 made of an insulating resin such as polyamide resin is fixed to the inner periphery of the opening end of the recess 13. One end of the insulating ring 31 is brought into contact with a step portion provided on the inner circumference of the opening end of the recess 13 to be positioned, and is fixed to a wall 13A surrounding the recess 13 with an adhesive 32. A threaded portion 31 is provided on the inner circumference of the insulating ring 31.
Although a is engraved, this screw part 31a is locally provided only in approximately half of the inner peripheral surface of the insulating ring near the cap 30.

As shown in FIG. 8, notched grooves 31b, 31b extending in the radial direction are provided at the upper end of the first insulating ring 31 at symmetrical positions apart from each other by 180 degrees, and these notched grooves 31b are formed. ,
Grooves 31c, 31c having an arcuate cross section extending in the axial direction are provided on the inner peripheral surface of the insulating ring 31 corresponding to the positions of 31b. A drainage groove is formed by these grooves 31b and 31c, and when moisture is generated in the recess 13 as in the case where iced dew is melted, the water can be discharged to the outside through the drainage groove. Has become.

Since the water drain groove is bent at a right angle on the way, there is no possibility that foreign matter such as wire will be inserted through the water drain groove.

On the other hand, the insulator cap 30 is formed in a shallow cup shape, and a second insulating ring 33 also made of an insulating resin such as polyamide resin is fixed to the inner circumference of the cap with an adhesive 34. The first insulating ring 31 is provided on the outer circumference of the second insulating ring 33.
A screw portion 33a that is screwed into the screw portion 31a is provided. The threaded portion 33a is locally provided only in approximately half of the outer peripheral surface of the insulating ring 33 near the connector 19, and the threaded portion 33a of the second insulating ring is screwed into the threaded portion 31a of the first insulating ring. As shown in FIG. 9, when the screw part 33a is rotated by a predetermined number of revolutions,
Goes over the screw portion 31a, and the insulator cap 30 runs idle. If the screw portion 33a is configured so as to pass over the screw portion 31a and run idle, the insulator cap does not come off even if it is rotated in the reverse direction due to vibration or the like, so that the concealment of the external electric wire connection portion can be more completely achieved. can do.

The axial length of the second insulating ring 33 is set such that the upper end of the second insulating ring 33 is located slightly above the upper end of the bolt 18, and the bolt 18 and the insulator cap 30 are attached with the insulator cap 30 attached. A predetermined gap is formed between them.

The bushing device is provided with the neck 12 of the porcelain insulator 10 in a case of an electric device (for example, a pole transformer) not shown with the axis of the bushing oriented horizontally or with the insulator cap oriented obliquely downward or downward. It is fixed to the case by inserting it into the mounting hole, and the internal lead wire 23 is connected to the electric device in the case. And the external wire insertion hole 25,25
The core wires (26a, 26a) of the external electric wires (26, 26) introduced into the recess (13) of the porcelain tube are connected to the electric wire connector (19), and both external electric wires are connected to the electric device through the electric wire connector (19) and the inner lead wire (23).

In the conventional bushing device, since the external wire is tightened by turning the knob insulator, it was not possible to use a torque wrench when tightening the external wire. Means) 18 for tightening the external electric wire, a torque wrench can be used. Therefore, it is possible to always tighten the connecting portion of the external electric wire with a uniform force, and it is possible to prevent a trouble from occurring due to an excessive or insufficient tightening force of the connecting portion of the external electric wire.

With the bushing device of the present invention, the introduction of external electric wires
Since the external electric wire insertion hole having a cross-sectional shape similar to that of the electric wire is used and the opening of the electric wire connector accommodating concave portion is closed by the insulator cap, the concealment of the charging portion can be completed. Therefore, it is possible to prevent the occurrence of bird damage and ensure the safety of hot line work.

In the above embodiment, when only one external electric wire 26 is connected, a lid made of an elastic insulating material such as synthetic rubber is inserted into the unused external electric wire insertion hole 25 to close the insertion hole. .

FIG. 10 shows an embodiment in which the present invention is applied to a bushing device provided with measures against salt damage. In this example, as the porcelain pipe 10, a salt porcelain resistant pipe having a cylindrical outer wall portion 10a on the outside is used. The other points are the same as in the above-mentioned embodiment.

In each of the above-described embodiments, the bolt 18 is used as the screw means for tightening the holding metal fitting 17 of the external electric wire connector to the terminal metal fitting 16, but the stud bolt penetrating the holding metal fitting 17 is fixed to the terminal metal fitting 16. It is also possible to screw a nut onto a stud bolt that penetrates the holding metal fitting and use the nut as a screw means for tightening the holding metal fitting.

[Advantage of the Invention] As described above, according to the present invention, an external wire insertion hole having a cross-sectional shape similar to that of the external wire is provided instead of providing the notch groove in the wall portion around the wire connector accommodating recess. While introducing the external electric wire into the recess through the insertion hole,
Since the opening of the recess is closed by the insulator cap, the gap generated near the introduction portion of the external electric wire can be almost eliminated, and the charging portion can be completely covered by the insulator cap. Therefore, there is an advantage that the concealment of the charging part can be completely prevented, the occurrence of bird damage can be prevented, and the safety of hot-line work can be ensured.

Further, in the present invention, by providing a guide portion on the external electric wire connecting device
Since the core of the external wire is configured to be sandwiched between the terminal fitting and the retainer after passing through the guide hole of the guide part, do not pass through the guide hole when the tip of the core wire is deformed. It is possible to prevent the occurrence of contact failure, disconnection, etc. due to connection of an external electric wire whose core wire is deformed and deteriorated.

Further, according to the present invention, since the screw means for tightening the core wire of the external electric wire connector is provided separately from the insulator cap, the tightening of the screw means can always be performed uniformly using the torque wrench, and the external electric wire can be tightened. It is possible to prevent trouble due to lack of strength.

In particular, according to the present invention, since the external wire connector is constituted by the holding metal fitting having the groove portion and the protruding portion which are fitted to each other and the terminal metal fitting, the rotation of the holding metal fitting is prevented by fitting the groove portion and the protruding portion. It is possible to perform the fixing work of the core wire by tightening the pressing fitting without rotating it with one screw means.

Further, in the present invention, since the holding metal fitting and the terminal metal fitting are provided with the core wire fitting grooves, respectively, the core wire is not moved when tightening the holding metal fitting to the terminal metal fitting, and the core wire is always attached to the terminal metal fitting and the holding metal fitting. Can be connected in the same positional relationship, and the electrical connection between the core wire and the connector can be made uniform.

Further, in the present invention, since the external electric wire insertion hole is provided on the same side, when connecting two external electric wires, the two external electric wires can be connected from the same side, and the pressing metal fitting is provided. Combined with the fact that the tightening can be easily performed with one screw means, there is an advantage that the work of connecting the external electric wire on the pillar can be facilitated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a partially cutaway embodiment of the present invention, and FIGS. 2 and 3 are main parts showing a state in which an external electric wire is connected in the same embodiment, respectively. FIG. 4 is a front view showing a vertical cross-sectional view and a cutaway view of essential parts, FIG. 4 is a front view showing a partially cutaway view of an external electric wire connector used in the same embodiment, and FIG. 5 is a holding metal fitting used in the same embodiment. A partially cutaway front view, FIG. 6 is an enlarged view of part A of FIG. 5, FIG. 7 is a sectional view taken along line BB of FIG. 6, and FIG. 8 shows the vicinity of the opening of the porcelain insulator of the same embodiment. FIG. 9 is a top view showing the same embodiment, and FIG. 9 is an enlarged cross-sectional view of an essential part showing a state in which an insulator cap is attached to an insulator tube. FIG. First
FIG. 11 is a partially cutaway front view of a conventional example, and FIG. 12 is a cross-sectional view of essential parts showing a state in which an external electric wire is connected to the bushing device of FIG. 10 ... Insulator pipe, 11 ... Head, 12 ... Lower neck, 13 ... Electric wire connector accommodating recess, 14 ... Through hole, 16 ... Terminal fitting, 16a2 ... Terminal fitting side core wire fitting groove, 16c ... Core wire guide portion, 16c2 ... Core wire guide hole, 1
7 ... Presser fitting, 17a2 ... Presser fitting side core wire fitting groove, 18 ... Bolt (screw means), 19 ... External wire connector, 25 ... External wire insertion hole, 26 ... External wire, 30 ... Insulator cap.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-60-89008 (JP, A) Actual development 51-112098 (JP, U) Actual public 38-15263 (JP, Y1)

Claims (4)

[Scope of utility model registration request] 1. A bushing device comprising a porcelain insulator (10) having at one end an electric wire connector accommodating recess (13) opened in the axial direction, and an external electric wire connector (19) provided in the recess. Two external wire insertion holes (2 with a similar cross-sectional shape to the external wires, with central axes parallel to each other and opened on the same side)
5) and (25) are wall portions (1) around the recess of the porcelain insulator (10).
3A), the external electric wire connector (19) has two external electric wires (2) introduced into the recess through the two external electric wire insertion holes.
6), a core wire guide portion (16c) having two core wire guide holes (16c2), (16c2) for penetrating the core wires (26a), (26a) of (26), and a bottom portion of the recess (13). The fixed terminal fitting (16), the core wire guide hole (16c2),
A pressing metal fitting (17) for sandwiching a core wire penetrating each (16c2) between the terminal metal fitting and one screw means (18) for tightening the pressing metal fitting to the terminal metal fitting; Each of the terminal fittings has a groove (17b) and a protrusion (16b) which are fitted with each other, and a core wire penetrating the two core wire guide holes is provided on each side of the protrusion (16b) of the terminal fitting. Two parallel terminal fitting side core wire fitting grooves (16a2) and (16a2) to be fitted are provided in alignment with the two core wire guide holes, and the terminals are provided on both sides of the groove portion of the holding fitting. Two holding metal fitting side core wire fitting grooves (17a2) and (17a2) facing the two core wire fitting grooves (16a2) and (16a2) of the fitting are provided, and the opening of the recess (13) is It is closed by an insulator cap (30) separated from the external electric wire connector. A bushing device characterized by the above. 2. A first portion having a threaded portion at an opening of the recess.
Second insulating ring (31) is fixed, and the insulator cap is provided with a threaded portion screwed to the first insulating ring.
The bushing device according to claim 1, wherein the insulation ring (33) is fixed. 3. The insulator according to claim 1, wherein when the first insulating ring is screwed onto the second insulating ring and rotated a predetermined number of times, the threaded portion of the first insulating ring passes over the threaded portion of the second insulating ring. The bushing device according to claim 2, wherein the respective screw portions of the first insulating ring and the second insulating ring are locally provided so that the cap rotates idle. 4. A utility model in which one or several projecting ridges (17e) extending in a direction substantially perpendicular to the axial direction of the core wire fitting groove are provided on the inner surface of the core wire fitting groove of the holding metal fitting. The bushing device according to any one of claim 1, claim 2, and claim 3.