JPS6010259Y2 - Mounting structure of upper terminal electric shock prevention cover on cylindrical cut-out switch, etc. - Google Patents

Description

[Detailed Description of the Invention] This invention particularly relates to a mounting structure for an electric shock prevention cover that covers the upper terminal fitting of a cylindrical high voltage cutout switch.

This type of protective cover is usually removed when mounted on a pole, so it is preferable for work to be able to easily attach it to the main insulator.Also, since the upper terminal is located at the top of the main insulator, rainwater etc. There was a need to eliminate looseness in the protective cover, as this could lead to intrusion and a decrease in dielectric strength.

This invention has been improved in view of these points, and examples embodying this invention will be described below.

First, the schematic structure of the main body insulator portion of a cylindrical high-voltage cutout switch will be explained according to FIGS. 1, 9, and 10. 1 is a cylindrical insulator with a fuse tube insertion hole 1a provided inside, The connecting fitting 2 is fixed to the inner periphery of the locking step 1b formed on the circumferential surface of the upper end opening, and the locking step 1
An upper terminal fitting 4, which will be described later, is screwed onto the connecting fitting 2 in the recess 3 on b, and the recess 3 on the outer periphery of the terminal fitting 4 is filled with an adhesive 5 such as hard lead to prevent rainwater from entering. are doing.

Reference numeral 6 denotes a tulip-shaped upper electrode attached to the inner end of the connection fitting 2, and numeral 7 denotes an extinction rod suspended from the inner end of the connection fitting 2 between the upper electrodes 6 via a spring 7a.

Reference numeral 8 denotes a lower electrode guide whose lower end peripheral edge portion 8a is engaged with a locking groove 9 formed on the inner periphery of the enlarged diameter hollow portion at the bottom of the fuse cylinder insertion hole 1a, and a truncated conical guide portion is provided on the inner periphery of the lower end portion. 8b, and lower contacts 11 facing each other are screwed to an electrode support plate 10 fixed to the inner periphery of the upper end.

12 is a lower terminal connected to the lower contactor 11.

Reference numeral 13 denotes a stopper screwed onto the inner periphery of the upper end of the lower electrode guide 8, and a rubber plate 1 for cushioning is provided between the stopper 13 and the stepped portion 1c formed at the upper end of the enlarged diameter hollow portion at the bottom of the fuse tube insertion hole 1a.
The lower end of the cylindrical arc-extinguishing tube 15 facing directly below the upper electrode 6 is supported while holding the electrode 4 between the two sides.

16 is a fuse tube installed in the cylindrical insulator 1,
The upper contact 16a at the upper end thereof is fitted between the upper electrode 6 and the extinction rod 7 so as to be releasable, and the lower electrode 17 at the lower end is fitted into the lower contact 11 of the lower electrode guide 8 so as to be releasable. I'm wearing it.

Note that 18 is a fitting for mounting the cylindrical insulator 1.

Further, the lower electrode guide 8 and the stopper 13 described above are integrally formed by screwing, but as shown in FIG. On the other hand, the retaining convex portion 19b formed on the outer periphery of the lower end of the stopper 13 may be integrally formed so as to be engaged with a sufficient adjustment space.

Next, the first embodiment of the upper terminal electric shock prevention cover, which is the main part of this invention, will be explained according to FIGS. One side of the flange portion is cut out in a flat shape, and a through hole 21 is provided through the flat portion 20a.

Reference numeral 22 indicates an upside-down upper part inserted into the terminal fitting 4 through the through hole 21, 23 indicates a screw hole provided at two places above and below the outer peripheral surface of the terminal fitting 4 directly below the through hole 21, and 24 indicates a protective cover 27 which will be described later. An external electric wire is introduced and connected into the terminal fitting 4 through the terminal fitting 4, and its base end is tightened into the terminal fitting 4 by a tightening bolt 25 screwed into the screw hole 23 through the upper stopper 22. It will be worn.

Reference numeral 26 denotes a male screw carved on the outer peripheral surface of the terminal fitting 4 above the collar portion 20.

Reference numeral 27 denotes a protective cover made of porcelain, and its upper wall is provided with a through hole 28 through which the external electric wire 24 passes.

Reference numeral 29 denotes an engagement groove formed on the inner bottom peripheral surface of the protective cover 27, and a bulge 29a forming the engagement groove is divided to form a notch 29b between the ends.

Reference numeral 30 indicates a tightening body having a female thread 31 therein, and reference numeral 32 indicates a leaf spring-like elastic member, two of which are protruded from positions opposite the upper edge of the tightening body 30. 29 with a sufficient gap space 32a.

Reference numeral 33 denotes a rotation preventing portion that protrudes from a portion of the circumferential surface of the tightening body 30 over the entire length in the longitudinal direction, and is fitted into the notch portion 29b of the engagement groove 29.

Now, the tightening body 30 engaged with the upper part inside the protective cover 27
When the protective cover 27 is gradually tightened from the state shown in FIG. 2 in which it is screwed into the screw 26 on the upper outer periphery of the upper terminal fitting 4, the bottom surface 27a of the protective cover 27 comes into contact with the upper surface of the cylindrical insulator 1 and rotates idly.

When the protective cover 27 is further rotated from this state, only the clamping body 30 is guided by the screw 26 and descends, and as shown in FIG. Bend upward within 32a.

In this state, the lower surface of the elastic member 32 is in pressure contact with the upper surface of the bulge 29a, so the clamping body 30 is tightened against the biasing force of the elastic member 32, and the protective cover 27 is firmly attached to the terminal fitting. Crown 4.

That is, since the fastening body 30 is always urged upward (in the opposite direction to the attachment direction) by the urging force of the elastic member 32, there is no risk of loosening.

Therefore, when attaching the protective cover 27 to the terminal fitting 4, there is no need to separately prepare a member to prevent loosening, and the work can be easily carried out.

Reference numeral 34 denotes a soft polyethylene upper cover that further covers the protective cover 27 that covers the terminal fitting 4, and the cylindrical wire holding portion formed to extend upward so as to be inserted into the external wire 24 has an inner diameter that is smaller than the outer diameter. It is formed to be slightly larger than the outer diameter of the covering of the electric wire 24, and restricts movement of the electric wire due to deflection, etc., so that the core wire of the electric wire is not easily cut.

Further, in the second embodiment shown in FIG. 7 and the third embodiment shown in FIG. 8, a tightening body 30 is bonded to the upper part of the inside of the protective cover 27 via a hakama adhesive 35 such as epoxy resin.

In the second embodiment, a disk spring-like elastic member 32 is projected from the lower end of the clamping body 30, and the clamping body 30 is screwed into the screw 26 on the upper outer periphery of the terminal fitting 4. At this time, the elastic member 32 comes into contact with the flange 20 of the terminal fitting 4, and similarly to the first embodiment, the elastic member 32 pushes the clamping body 3 with its biasing force.
0 to push the protective cover 27 upward.

Therefore, in this embodiment as well, when attaching the protective cover 27, the work can be easily carried out without requiring a separate member for preventing loosening.

In the third embodiment, a coil spring is used as the elastic member 32, and the elastic member 32 attached to the lower end of the clamping body 30 is similar to the disc spring in the second embodiment. The terminal member 4 can be biased into contact with the flange 20 of the terminal member 4.

The effects of this embodiment are also similar to those of the previous embodiment.

As described in detail above, this device has a terminal fitting protruding from the upper end of the cylindrical insulator through which an external electric wire is introduced, a screw is provided on the upper outer periphery of the terminal fitting, and a protection device is placed to cover the terminal fitting. A clamping body that is screwed onto the screw of the terminal fitting is mounted inside the cover, and the clamping body is attached in the opposite direction when the clamping body is screwed onto the terminal fitting. By providing the elastic member that applies the force, there is no need to attach a separate member to the terminal fitting in advance to prevent loosening, or to attach it after covering the protective cover. It can be installed easily and firmly, and when it becomes necessary to replace the protective cover or change the connection of electric wires, the protective cover can be easily removed. This is a preferred structure for mounting an upper terminal electric shock prevention cover on a cylindrical cut-out switch, etc., because it is easy to install and prevents electric shock at the terminal portion.

[Brief explanation of drawings]

Figure 1 is an overall view of a cylindrical cut-out switch incorporating an electric shock prevention cover which is the first embodiment of this invention, Figure 2 is an enlarged view showing the electric shock prevention cover which is the first embodiment, and Figure 3 is an enlarged view showing the electric shock prevention cover which is the first embodiment.
The figure is a perspective view showing the terminal fitting and the clamping body in the first embodiment, Figure 4 is a sectional view taken along line XX in Figure 2, and Figure 5 is the attachment of the clamping body to the protective cover in the first embodiment. A diagram showing the state,
Fig. 6 is a diagram showing the movement of the elastic member of the clamping body in the first embodiment, Fig. 7 is a diagram showing the electric shock prevention cover in the second embodiment, and Fig. 8 is a diagram showing the electric shock prevention cover in the third embodiment. The figure showing the cover, and FIGS. 9 and 10 are enlarged views showing the structure of the lower electrode attachment part. Cylindrical insulator...1, Terminal fitting...4, Protective cover...27, Engagement groove...29,
Tightening body: 30, elastic member: 32°

Claims (1)

[Scope of Claim for Utility Model Registration] ■ A terminal fitting into which an external electric wire is introduced protrudes from the upper end of the cylindrical insulator, a screw is provided on the upper outer periphery of the terminal fitting, and a protective cover is arranged to cover the terminal fitting. A clamping body that is screwed onto the screw of the terminal fitting and is not rotatable with respect to the protective cover is installed inside, and the clamping body has a locking body that is screwed into the terminal fitting when the tightening body is screwed onto the terminal fitting. A structure for mounting an electric shock prevention cover on an upper terminal of a cylindrical cut-out switch, etc., characterized by providing an elastic member that urges a clamping body in a direction opposite to the mounting direction. 2. The tightening body is attached to the inner surface of the protective cover so as to be unrotatable and movable up and down, and the elastic member is integrally provided on the outer periphery of the tightening body, and the tip thereof is attached to the protective cover. In practical use, the protection cover is formed so that the bottom surface of the protective cover can come into contact with the top surface of the cylindrical insulator. A mounting structure for an upper terminal electric shock prevention cover in a cylindrical cut-out switch, etc. as claimed in claim 1. 3. The clamping body is unrotatably fixed to the inner surface of the protective cover with an adhesive, and the elastic member is provided in the shape of a disc spring to the lower end of the clamping body, and its tip extending downward is An attachment structure for an upper terminal electric shock prevention cover in a cylindrical cut-out switch or the like as claimed in claim 1, which is formed so as to be able to be latched onto a flange protruding from a terminal fitting. 4. The clamping body is unrotatably fixed to the inner surface of the protective cover with an adhesive, and the elastic member is a coil spring attached to the lower end of the clamping body, and the lower part of the coil spring is An upper terminal electric shock prevention cover in a cylindrical cut-out switch, etc., according to claim 1 of the utility model registration claim, which is formed so as to be able to be locked on a flange protruding from a terminal fitting;
mounting structure.