JPS5921473Y2 - Pole switch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the case of a pole-mounted switch, which houses the switch in a metal case and isolates the main part from the outside air.

This type of switch has a structure in which the main parts are housed in a case to prevent rusting of the electrode part and deterioration of the silk material of the insulating support.However, in the conventional structure shown in Figure 4, the case is The upper surface 101 of the case 100 is formed in a flat shape, and is easily distorted, so that the rain washing effect during rain cannot be expected to be very effective, which causes the case to corrode.

Additionally, a fixing force bar 1 is attached to the bushing 102 protruding from both sides of the case to cover it.
03 was firmly fixed to prevent the bushing 102 from being damaged.

However, since the bushing cover 103 is entirely formed of a single metal plate, it is safe to expect that the bushing 102 will have almost no rain washing effect, but if used on the coast or in polluted areas, the dielectric strength will drop significantly, and the bushing Birds build nests in the space A of the bushing cover, causing short-circuit accidents. In the structure of an explosion-proof safety valve in a high-pressure air switch, a gas exhaust port 104' is bored in the upper side of the case body 100', and the gas exhaust port is connected from the outside by an attached plate 105'. We proposed a structure for a safety valve in which the plate is airtightly adhered, and when a short circuit occurs, a part of the plate is detached by internal pressure. This can cause an internal short circuit and cause damage to the inside of the case, so it cannot necessarily be said that the structure is perfect.

In order to eliminate the above-mentioned drawbacks, the present invention is a pole-mounted switch in which the main parts of the switch are housed inside the case, except for the operation bundle of the switch. A protective rod that also serves as a carrying handle is attached to the bushing, which is formed on an inclined surface that descends from the ground, and is fixed on both sides to protect the bushing. The present invention relates to a pole-mounted switch characterized in that it is provided with a discharging fitting whose tip is formed at an acute angle.

In Fig. 1, a support fitting 2 and a mounting fitting 3 for attaching the switch to the arm of a telephone pole are placed on the upper part of a metal (iron) case 1.
, the utility pole attachment device A consisting of bolts is fixed, and the upper surface 1 is fixed.
a are respectively formed as inclined surfaces descending toward the bushings 4 and 4'.

Reference numeral 5 denotes a protection rod that protects the switch bushings 4, 4' from collision, and includes a horizontal portion 5a placed at the top of the bushings 4, 4', and a case side surface 1b at both ends of the horizontal portion 5a.
The horizontal part 5a protrudes in the same direction as the bushing 4, and the reinforcing part 5b has one end attached to the horizontal part 5a and the other lower end attached to the case 1. They are fixed to the side surfaces 1b to protect the side surfaces of the bushing 4 from collisions, and at the same time increase the mechanical strength of the attachment of the horizontal portion 5a of the protection rod 5, which also serves as a carrying handle, to the case.

In addition, bushings 4 that protrude laterally are fixed to both sides of the main body case 1 using flange fittings 6, bolts 7, and nuts 8, respectively, and movable electrodes (not shown) are opened and closed on both sides in the longitudinal direction. It comprises an operating bundle 9 and a pointer 10 interlocked with the operating bundle 9 to notify the open/closed state.

11 shows a similar pointer mounted on the opposite side of the case to the operating bundle 9.

A discharging fitting 12 having an acute-angled tip is provided on the horizontal portion 5a of the protective rod 5 facing downward to face the conductor portion 13 of the bushing 4, which prevents abnormal voltages such as those caused by lightning from entering. In such a case, a flash short circuit is caused between the metal fitting 12 and the conductor portion 13 to prevent flash short circuit within the case as much as possible.

14, in the unlikely event that a preliminary flash (discharge) is not performed by the external discharge electrode, that is, if an internal flash occurs, the other fastening part 16 is removed using the fastening part 15 as a reference point, and the gap is removed. This indicates a safety valve that releases the pressure inside the case to the outside.The tightening force of the bolt 17 is adjusted and assembled, and the letters 18 prohibiting opening are added to prevent it from being easily removed during construction. is written.

Reference numeral 19 denotes a stopper which also serves as a hanging metal fitting for regulating the opening angle of the safety valve 14 attached on both sides, and is fixed to the above-mentioned two locations of the safety valve.

Reference numeral 20 denotes a bottom cover, which is airtightly attached with bolts and nuts, to which installation legs 21 and ventilation pipes 22 are fixed.

23 is a grounding terminal, 24 is a terminal cover, etc.

As mentioned above, in this invention, the top surface of the switch case is sloped to allow rainwater to flow easily, making it difficult for salt dust to flow and adhere to the switch case, thereby minimizing corrosion of the case itself. In addition, by fixing the protective rod around the bushing, which also serves as a handle, the bushing is prevented from being damaged.Furthermore, the bushing is exposed and its surface is washed by rainwater, etc., as described above. In addition, as a result of using a protective rod and installing a discharging metal fitting opposite the live part of the bushing, if abnormal voltage such as lightning enters, it can be removed outside the case. This prevents damage from spreading inside the case by minimizing advance discharge (flash short circuit), making it possible to provide an extremely reliable pole-mounted switch.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the present invention, Fig. 2 is a front view, Fig. 3 is a vertical sectional view showing the bushing, Fig. 4 is a side view and front view showing the conventional structure, Fig. 5 is a front view showing the same conventional structure. A...Telephone pole mounting device, 1a...Top surface,
4.4'...Bushing, 5...Protection rod, 12...Discharge fitting.

Claims (1)

[Scope of utility model registration request] Both sides of the upper part of the case are formed into slopes that descend along the sides, and on both sides of the case, there are side members located above the bushing protruding from the iron surface and surrounding the bushing when viewed from the top. A diagonal member is installed between the --shaped member and the case, and the diagonal member is provided on both sides of the bushing and protrudes in the opposite direction. Pole-mounted switch equipped with