JPH0451424Y2 - - Google Patents

Description

[Detailed Description of the Invention] Purpose of the Invention (Field of Industrial Application) This invention relates to a structure for connecting an insulated wire to a terminal of electrical equipment for connecting an insulated wire to an electrical equipment such as a lightning arrester.

(Conventional technology) Conventionally, as an example of connecting electric wires to electrical equipment,
As shown in FIG. 5, for example, an insulated wire 24 drawn from a high-voltage line 23 may be connected to a lightning arrester 22 mounted on a utility pole 21.

In the above case, as shown in FIG.
Peel off the insulation coating at the tip of 4 and insert the core wire 2.
4a is exposed, and the core wire 24 is inserted into the through hole 25a of the connection electrode 25 protruding from the top of the lightning arrester 22.
a, and insert the core wire 24a into a pair of upper and lower washers 2.
It was clamped by a pair of nuts 27 via 6.

(Problems to be Solved by the Invention) Therefore, in the conventional case, each time the insulated wires 24 were connected, it was necessary to strip off the insulation coating to expose the core wires 24a, which was troublesome.

In addition, the core wire 24a from which the insulation coating has been stripped is attached to the washer 2.
Since the insulated wire 24 is locally pinched by the wires 6 and connected to the connection electrode 25, if the insulated wire 24 swings, there is a risk that the core wire 24a may be bent at the connection portion and damaged, leading to poor connection. It was hot.

This invention was made in view of the above-mentioned circumstances, and it not only makes it possible to easily and securely lock and grip insulated wires to the terminals of electrical equipment, but also to make electrical connections, and to reduce damage to the core wires at the connection parts. The purpose of this invention is to provide a connection structure for insulated wires that can reduce connection failures.

Structure of the invention (means for solving the problem) In order to solve the above problem, this invention provides a hollow part into which an insulated wire can be inserted in the axial direction in the terminal of the electrical equipment, and the insulated wire is inserted into the terminal using a soft metal. An electric wire gripping tool that is formed into a cylindrical shape into which the terminal can be inserted, and that is attached to the outer periphery of the terminal at the terminal crowning part on the distal end side, and attached to the outer periphery of the insulated electric wire at the electric wire fixing part on the proximal end side. , and a knob piece having a substantially U-shaped cross section that can be compressed in the circumferential direction of the wire gripper is connected to the outer periphery of each part of the wire gripper at its open end, and the grip piece is compressed. Each part of the electric wire gripping tool is configured to have a reduced diameter, and further, a contact is inserted through the terminal-covering part of the electric wire gripping tool, and the tip of the contact is inserted into the hollow part of the terminal and the hollow part thereof. It is configured to penetrate the insulation coating of the inserted insulated wire and connect to the core wire.

(Function) Therefore, the wire gripping tool is attached to the outer periphery of the terminal in advance at its terminal-covering portion, and then the insulated wire is inserted into the hollow portion of the terminal of the electrical equipment through the wire fixing portion of the wire gripping tool. When the diameter of each part of the wire gripper is reduced by pinching the knob of the wire gripper, the terminal crowning part is fixed to the terminal, and a part of the insulated wire is gripped by the wire fixing part. Ru. Next, when the tip of the contact that is inserted through the wire gripper is passed through the hollow part of the terminal and the insulation coating of the insulated wire inserted into the hollow part and connected to the core wire, the insulated wire is inserted through the contact. is locked to the terminal, and the core wire and the terminal are electrically connected.

(Example) Hereinafter, an example in which this invention is embodied in a lightning arrester will be described in detail based on FIGS. 1 to 4.

Now, in this embodiment, as shown in FIG. 1, a substantially cylindrical insulating cover 2 made of rubber is fitted around the outer periphery of the upper end of a lightning arrester 1 as an electrical equipment. A drain hole 2a is provided.

At the upper end of the lightning arrester 1, a power supply side terminal 3 is fixed at its lower end by tightening with a bolt 9, and projects upward. The terminal 3 is formed with a hollow portion 3a that extends in the axial direction and into which an insulated wire 4 can be inserted, and a base end for draining water such as rainwater, and an insulated wire 4 inside the hollow portion 3a.
A through hole 3b is formed which also serves as a visual confirmation of the inserted state.

The outer periphery of the terminal 3 and the insulated wire 4 is made of a conductive soft metal such as copper, aluminum, or brass.
An electric wire gripper 5 formed in a substantially cylindrical shape is attached to straddle both the above-mentioned 3 and 4. That is,
The wire gripping tool 5 is composed of a proximal terminal crowning portion 5a attached to the outer periphery of the terminal 3, and a distal end wire fixing portion 5b attached to the insulated wire 4. It has a flap-shaped opening toward the top to facilitate insertion. Further, on the outer periphery of each part 5a, 5b of the wire gripper 5, a total of three knob pieces 6, which have a substantially U-shaped cross section and can be compressed in the circumferential direction of the wire gripper 5, are provided at their open ends. Connection is fixed. As shown in FIG. 3, when each knob piece 6 is compressed, a part of the wire fixing part 5b is held inside the knob piece 6, and the wire fixing part 5b is compressed, and its diameter is reduced. An insulated wire 4 is gripped and fixed. Similarly, by compressing the knob 6 in the terminal-covering portion 5a, the diameter of the terminal-covering portion 5a is reduced and fixed to the terminal 3.

Further, a drop-off prevention piece 8 is fixed to the base end of the terminal 3 with its ring-shaped base end 8a, and a contact 7 made of a pair of tapping screws is supported through the upright portion 8b of the drop-off prevention piece 8. and its tip is connected to the core wire 4b by passing through the terminal crowning part 5a of the wire gripping tool 5, the hollow part 3a of the terminal 3, and the insulation coating 4a of the insulated wire 4 inserted into the hollow part 3a. At the same time, it is locked to the core wire 4b. Thereby, the insulated wire 4 is locked to the terminal 3 via the contactor 7, and the core wire 4b and the terminal 3 are electrically connected.

Therefore, in order to connect the insulated wire 4 to the terminal 3, as shown in FIG. The terminal covering portion 5a is attached. Then, attach the tip of the insulated wire 4 to the wire fixing part 5.
b and insert it to the base end of the hollow part 3a of the terminal 3. At this time, a slight gap is formed between the insulated wire 4 and the wire gripper 5, as shown in FIG. Next, each knob 6 is compressed to reduce the diameter of each part 5a, 5b of the wire gripping tool 5, and the terminal covered part 5 is compressed.
a is fixed to the terminal 3, and a part of the insulated wire 4 is held by the wire fixing part 5b. Subsequently, the contactor 7 is tightened and its tip is attached to the terminal crowning part 5.
a, the hollow part 3a of the terminal 3 and the insulation coating 4a of the insulated wire 4 inserted into the hollow part 3a are penetrated, and connected to the core wire 4b. As a result, contact 7
The insulated wire 4 is locked to the terminal 3 via the insulated wire 4, and the core wire 4b and the terminal 3 are electrically connected.
After that, when the insulating cover 2 is attached to the tip of the lightning arrester 1, the connection part of the insulated wire 4 and the wire gripper 5 are removed.
etc. will be protected.

As described above, in this embodiment, unlike the conventional example, not only is it not necessary to strip off the insulation coating of the insulated wire 4 one by one, but also the wire gripping tool 5 is
Each part of the wire grip 5 can be attached to the outer periphery of the terminal 3 at step a, and after inserting the insulated wire 4 into the hollow part 3a of the terminal 3 through the wire grip 5, the grip piece 6 is compressed with a simple one-touch operation. 5
a, 5b can be reduced in diameter, and since the diameter reduction force is applied uniformly in the circumferential direction of the wire gripper 5, it is possible to deform the hollow portion 3a of the terminal 3 or apply shear stress to the core wire 4a of the insulated wire 4. The terminal 3 and the insulated wire 4 can be gripped and fixed with strong force without applying any force, and then the contact 7, which has been passed through the terminal crowned part 5a of the wire gripping tool 5, is attached so that its tip end is attached to the insulated wire 4. The locking and electrical connection between the insulated wire 4 and the terminal 3 can be achieved extremely easily and reliably by simply tightening the wire until it locks onto the core wire 4a. Further, since the insulated wire 4 is protected by being inserted into the hollow portion 3a extending in the axial direction, even if the insulated wire 4 swings, the core wire 4b of the connecting portion will not bend due to the impact. It won't get damaged by shaking,
Poor connection between the core wire 4b and the terminal 3 can be prevented.

Note that this invention is not limited to the above-mentioned embodiments, and the main idea of the invention may be modified, for example, by protruding the terminal 2 laterally from the side of the electrical equipment, omitting the falling-off prevention piece 8, etc. It can be changed as appropriate without departing from the above.

Effects of the invention As detailed above, according to this invention, not only is there no need to strip off the insulation coating, but the grip piece is compressed after the insulated wire is inserted into the hollow part through the wire gripper attached to the outer periphery of the terminal. With just one touch, it is possible to grip and fix the terminal and insulated wire with strong force without deforming the hollow part or applying shear stress to the core wire, and then penetrates the wire gripper and locks it to the core wire. It is possible to lock the terminal and the insulated wire and make an electrical connection extremely simply and reliably by simply tightening the contact until This has an excellent effect of preventing connection failures.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of this invention, and Figure 1 is a partial cross-sectional view of an insulated wire connection part;
Figure 2 shows the state of the knob before compression with the X in Figure 1.
3 is a sectional view taken along the line X--X of FIG. 1 showing the compressed state of the knob, and FIG. 4 is an exploded front view of the insulated wire connection portion. FIG. 5 is a front view of a conventional lightning arrester in an installed state, and FIG. 6 is an exploded perspective view of a connecting portion of insulated wires of the conventional example. 1... Surge arrester as electrical equipment, 3... Terminal,
3a...Hollow part, 4...Insulated wire, 4a...Insulation coating, 4b...Core wire, 5...Wire gripping tool, 5a...
...Terminal covering part, 5b... Wire fixing part, 6... Knob piece, 7... Contact piece, 8... Fall-off prevention piece.

Claims (1)

[Claims for Utility Model Registration] 1. A hollow portion 3a is provided in the terminal 3 of the electrical equipment 1 into which an insulated wire 4 can be inserted in the axial direction, and the hollow portion 3a is formed of a soft metal into a cylindrical shape through which the insulated wire 4 can be inserted, and , a wire gripper is provided which is attached to the outer periphery of the terminal 3 at the terminal crowning part 5a on the distal end side, and attached to the outer periphery of the insulated wire 4 at the wire fixing part 5b at the proximal end side; A knob piece 6 having a substantially U-shaped cross section that can be compressed in the circumferential direction of the electric wire gripping tool 5 is connected to the outer periphery of each of the parts 5a and 5b of the electric wire gripper 5 at its open end, and by compressing the knob piece 6. Each part 5a, 5b of the electric wire gripper 5 is configured to have a reduced diameter, and the terminal crowned part 5a of the electric wire gripper 5 is configured to have a reduced diameter.
The contact 7 is inserted through the terminal 3, and the tip of the contact 7 is passed through the hollow part 3a of the terminal 3 and the insulation coating 4a of the insulated wire 4 inserted into the hollow part 3a, and connected to the core wire 4b. A connection structure for an insulated wire to a terminal of an electrical equipment, characterized in that it is configured as follows. 2. The contactor 7 locks a drop-off prevention piece 8 fixed to the terminal 3 and is penetrated by the wire gripper 5. Utility model registration Claims 1. Connection structure.