JPH0525156Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention A-1. Field of Industrial Application The present invention relates to a structure for preventing electric shock in a cylindrical cut-out fuse tube.

A-2 Prior Art Conventionally, as shown in FIG. 10, a fuse cylinder 9 was installed in the main body 2 as a cylindrical cut-out, with the lower end 2a of the main body 2 opened, and when the fuse was blown.
There is one in which the display tube 17 at the lower end of the lower end protrudes from the lower end opening 2a of the main body 2 to display a fusing indication.

A-3 Problems to be Solved by the Present Invention In the conventional device, the lower end of the display tube 17 is inserted into the lower end opening of the main body so that the display tube 17 protrudes from the lower end opening 2a of the main body 2 when the display tube 17 is cut. Since it is necessary to set the folded part 21a of the fuse lead wire 21 passing through the lower end of the display tube 17 at a position close to the lower end opening 2a of the main body 2, becomes.

Therefore, while working on the pole, there was a risk that a worker might fall on the lead wire, which is a live part, and touch it, resulting in an electric shock accident.

The present invention aims to solve the above problems with a simple structure.

B. Configuration of the Device B-1. Means for solving the Problems In order to solve the above problems, the device is a cylindrical cut-out in which a fuse tube is detachably attached to a cylindrical body with an open bottom end, the fuse tube is configured with an upper electrode at the top of an insulating tube, a lower electrode at the bottom, and an indicator tube at the bottom, and the lead wire of the fuse loaded inside the insulating tube is led out from the bottom of the indicator tube and then folded back to connect to the lower electrode,
The display tube is characterized in that an insulating electric shock prevention device is attached to cover the folded-back portion of the lead wire.

RO-2 Embodiment Next, a first embodiment of the present invention will be described with reference to FIGS. 1 to 5. 1 is a cylindrical cutout,
Reference numeral 2 denotes a cylindrical body made of porcelain, whose upper end is closed and whose lower end 2a is open. 3a is an upper connection terminal of the upper fixed electrode 3 which protrudes upward from the through hole 2b at the upper end and is fixed to the main body, and the terminal is provided with a wire tightening screw 4, a holding fitting 5, and a fixing screw 6. There is. 7 is a porcelain insulator tube whose threaded part is screwed into the fixing screw 6 of the upper terminal so as to cover the outer periphery of the terminal exposed outside the main body; 8 is attached to the wire insertion hole 7b of the insulator tube 7. The rubber bush 3b is a tulip-shaped contact piece connected to an upper terminal suspended from the upper part of the main body, and comes into contact with an upper electrode 10 of a fuse pipe 9, which will be described later. Reference numeral 11 denotes an arc extinguishing cylinder that forms a narrow arc extinguishing section together with the arc extinguishing rod 12, and a rubber member is provided at the upper end of the cylinder to close the gap formed between the outer peripheral surface 11a of the cylinder and the inner peripheral surface 2c of the main body. A fastening body 13 consisting of, etc. is provided. 14 is a lower fixed electrode;
A fuse tube 9 is held vertically within the main body 2 by contacting a lower electrode 15 and an upper electrode 10 of a fuse tube, which will be described later, with respect to the above-mentioned upper electrode 3. Reference numeral 9 denotes a fuse tube, and the insulating tube 16 has a cylindrical upper electrode 10 at its upper part, a lower electrode 15 at its lower part, and a display tube 17 integrally provided at its lower end below the lower electrode. It is being 1
Reference numeral 8 denotes a spring seat that is integrally fixed to the upper end of the display tube 17, and the engagement protrusion 18a and the engagement recess 15a at the lower end of the lower electrode 15 are rotatable relative to each other when the fuse is attached. engaged. 19
2 is a coil spring interposed in a compressed state between the lower electrode 15 and the spring seat 18; 20 is a fuse lead wire;
Reference numeral 1 indicates an insertion guide for the fuse tube, 14a indicates a lower connection terminal of the lower fixed electrode, 22 indicates a mounting bracket mounted at the center of the main body 2, and 23 indicates a wire insertion plug made of an insulating material such as synthetic resin or rubber. .

When loading the fuse lead wire 20 into the fuse tube 9, the lead wire 20 of the fuse is first guided out of the tube through the arc discharge port 17a of the display tube at the lower end, more specifically, through the U-shaped notch 17b of the display tube 17, and then After the led wire is further folded upward, its tip is connected to the lower electrode 15 with a tightening screw 24. Reference numeral 25 denotes an electric shock prevention device made of an insulating material such as rubber or synthetic resin that is fixed to the lower end surface 17c of the display tube 17 with an adhesive member 26 such as an adhesive or an adhesive, and a lead wire led out of the tube. The folded part 20a is covered so that it cannot be touched especially from the lower side, and the preventer has a slight thickness t in order to keep the distance from the folded part 20a, which is a live part, as far as possible. In addition, a hole 25a is provided in the center of the preventer 25 from which a rating display piece 27 attached to the fuse 28 protrudes. In addition, the cylindrical preventive device has an outer diameter that is the same as or smaller than the outer diameter of the display tube, which may interfere with the operation of attaching and detaching the fuse tube using the insulated operating rod 28. Efforts have been made to avoid this. In addition to the protrusion of the display piece 27, the hole 25a also serves to discharge arcs etc. released from the lower end arc discharge port 17a of the display tube 17 to the outside when the fuse is shut off. have 29' is a display sticker affixed to the display cylinder 17.

Note that the electric shock preventive device 25 needs to be attached to the display tube 17 at the lower end with the center of the tube and the center of the hole of the preventive device aligned with each other, as shown in FIG. Therefore, an attachment aid 29 that fits over the upper part of the insulated operation rod 28 is used to attach it to the display tube.

Next, FIG. 8 shows an embodiment of another electric shock prevention device, in which an electric shock prevention device 25 made of an insulating material such as rubber or synthetic resin is shaped like a cap.
The preventer 25 has an upwardly extending portion 25b with respect to the outer circumferential surface 17d of the display tube 17 and a folded portion 2 of the lead wire.
It is applied so as to cover 0a.

Reference numeral 25a denotes a hole provided in the center of the bottom surface 25c, which allows the fuse rating display piece to protrude and emit the arc in the same manner as described above.

Further, the electric shock preventive device 25 shown in FIG. 9 shows yet another embodiment, and is attached by inserting a locking portion 25d extending upward from below into the arc discharge port 17a at the lower end of the display tube 17. This is an electric shock prevention device with a hole 25 extending from the locking part to the bottom surface.
A is provided.

C. Effects of the invention Since the present invention has the above-described configuration, even if the folded part of the lead wire connected to the lower electrode is close to the opening at the bottom end of the main body, the folded part of the lead wire can be protected from the electric shock protector. Since it is covered by a wire, even if a worker falls down and touches the display tube, he or she will not touch the lead wires and will not receive an electric shock. Further, since the electric shock prevention device is attached to the display tube at the lower end of the fuse tube, the device can be attached without first removing the fuse tube from the main body. Moreover, this electric shock prevention device has a simple structure and can be implemented at low cost. In addition, since a hole is formed in the center of the electric shock prevention tool, it does not prevent the release of arc, etc. from the arc discharge port at the lower end of the display tube when shutting off, so that there is no deterioration in the shutting performance. In addition, if the electric shock prevention tool is made of rubber or synthetic resin,
Even if the electric shock prevention device were to fly off when a large current was cut off, it would not cause any secondary disaster and would be safe.

In particular, in this invention, the rating display piece 27 of the fuse is made to protrude outside from the hole 25a of the electric shock preventive device, so that the rating of the fuse can be visually confirmed from the ground side. The fuse to be used can be prepared in advance and lifted, allowing for quick replacement work.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a cylindrical cutout equipped with the present invention, Fig. 2 is a side view thereof, Fig. 3 is a cutaway view of the main part of the fuse tube with the electric shock preventive device of the present invention attached, and Fig. 4 The figure is a side view of the lower part of the fuse tube with the electric shock protector attached, Figure 5 is a front view of the electric shock protector, and Figure 6 is an explanatory diagram of the electric shock protector installed using the installation aid. FIG. 7 is a plan view of the installation aid, FIGS. 8A and B are front views and sectional views showing another embodiment of the electric shock preventive device, and FIGS. 9A and B are plan views showing still another embodiment. and FIG. 10 is a side sectional view of the main part showing the conventional structure. 2...Main body, 2a...Lower end, 9...Fuse tube, 10...Upper electrode, 15...Lower electrode, 16
...Insulating tube, 17...Display tube, 17a...Arc outlet, 20...Fuse lead wire, 20a...
Folded portion of lead wire, 25...Electric shock prevention device, 2
5a...Hole part.

Claims (1)

[Claims for Utility Model Registration] A fuse tube 9 is removably attached to a cylindrical body with an open bottom end, and the fuse tube 9 is connected to an insulating tube 16 with an upper electrode 10 on the top and a lower electrode on the bottom. The electrode 15 is further configured by providing a display tube 17 at the lower end, and a lead wire 20 of a fuse loaded in the insulating tube is folded back from the lower part of the display tube through the lower end outlet 17a of the insulating tube and connected to the lower electrode. In the cylindrical cutout for connection, a rating display piece 27 is attached to the fuse in a hanging manner to the display tube, and an insulating electric shock prevention device 25 is provided to cover the folded portion of the lead wire. The electric shock preventive device 25 is provided with a hole 25a communicating with the lower end discharge port 17a of the insulating cylinder, and the rating display piece 27 is made to protrude outside through the hole 25a. Structure to prevent electric shock in discharge type fuse tube.