JPH0121467Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a fuse mounting device for holding a fuse in a fuse-equipped switch or other electrical equipment.

Purpose This invention makes the elastic forces of a pair of contacts that sandwich and hold a fuse link different from each other. By making the central angle formed between the tips of the contact parts obtuse, the fuse link can be easily attached and removed when replacing the fuse link, and it can be attached to each contact so as to straddle the two contacts. To provide a fuse mounting device that prevents a fuse link from falling by itself when a presser plate that presses the fuse link is removed.

Embodiment An embodiment of this invention in an air switch will be described below with reference to FIGS. 1 to 7.
In FIG. 1, reference numeral 1 denotes a pair of left and right fixing bases, and 2a and 2b denote a pair of upper and lower mounting frames installed between both the fixing bases 1. Reference numeral 3 denotes three supporting insulators protruding from one of the mounting frames 2a, each of which has a mounting base 4 fixed at its tip having a terminal portion 4a for connecting a lead wire. 5 is a bearing part provided on a part of the mounting base 4, and 6 and 7 are a pair of left and right first and second contacts rotatably attached to the bearing part 5, respectively. are arc-shaped contact portions 6a,
7a, which cooperate with each other to enable the electrode portion at one end of the fuse link 8 to be clamped.

The contact portion 6a of the first contact 6 is longer than the contact portion 7a of the second contact 7, and has a slightly thinner plate thickness. That is, the first contact 6 is formed to have a weaker elastic force than the second contact 7. Furthermore, both the contacts 6 and 7 are arranged so as to hold more than half of the outer circumference of the fuse link 8, and the axis of the clamped fuse link 8 and the contact portion 6 of both the contacts 6 and 7 are
The aperture angle α formed between the tips of a and 7a is always an obtuse angle. That is, as shown in FIG. 4, a bisector n of the opening angle α with respect to a vertical line m extending from the fuse mount 4
The tips of both the contacts 6 and 7 are opened so that the contacts 6 and 7 are deflected.

6b is a mounting portion formed by bending the tip of the first contact 6, and 7b is a locking portion formed by bending the tip of the second contact 7, and an engagement groove is formed in the center along the circumferential direction. A notch is formed at 7c.

Reference numeral 9 denotes an arc-shaped presser plate, which has a T-shaped engagement portion 9a that can engage with the engagement groove 7c at the tip of the second contact 7 at one end, and a T-shaped engagement portion 9a at the other end. A mounting portion 9b which can be fastened to the mounting portion 6b of the first contactor 6 with a bolt 10 is bent and formed so that the fuse link 8 can be pressed into contact with the mounting portion 9b.

The first contactor 6, the second contactor 7, and the presser plate 9 constitute a fuse mounting device 11.

Reference numeral 13 denotes a fuse attachment device that is attachable to the other end of the fuse link, and is composed of a first contact 6, a second contact 7, and a holding plate 9 similar to the fuse attachment device 11. There is. Reference numeral 17 shown in FIG. 2 is a movable contact blade protruding from the first contactor 6 of the fuse mounting device 13 toward the fixed base.

Note that 12 is a fuse support stand made of an insulating material and installed between the fuse attachment devices 11 and 13.

Reference numeral 18 denotes three body insulators protruding from the top of the upper mounting frame 2, each of which is provided with a fixed electrode (not shown) for inserting the movable contact blade 17 therein. 19 is an arc extinguishing chamber provided in the main insulator 18.

Reference numeral 20 denotes an operating shaft that is mounted between both fixed bases 1 so as to be located on the lower surface of the lower mounting frame 2, and a connecting lever 21 is fixed at a position corresponding to the fuse link 8 of each phase. Reference numeral 22 denotes a push-up lever whose ends are rotatably pivoted to the connecting lever 21 and the support plate 12, respectively. In Figure 1, 2
3 has one end attached to a locking lever (not shown) fixed to the operating shaft 20, and the other end attached to the upper mounting frame 2.
b, which is a spring attached to the fuse link 8 and urges the fuse link 8 to rotate in the opening direction with respect to the main insulator 18 via the connection lever 21 and the push-up lever 22.

Reference numeral 24 designates a charging handle fixed to one end of the operation shaft 20, and 25 designates an open handle having a base end tiltably attached to a shaft 25a at the center of the charging handle 24. 2
Reference numeral 6 denotes a locking member rotatably pivoted to the side of the fixing base 1, and is capable of engaging and fixing the shaft 25a of the release handle 25.

Note that when the distal end of the release handle 25 is rotated left and right in the state shown in FIG. The lock of the input handle 24 is released, and the switch is opened as shown by the chain line.

The operation of the fuse mounting device configured as above will be explained.

Now, in order to replace the fuse link 8 with the air switch open as shown in Fig. 3, loosen the bolts 10 of the fuse mounting devices 11 and 13, and release the engaging portion 9a of the presser plate 9 from the engaging groove 7c. and rotate it 180 degrees as shown by the chain line in Figure 4. At this time, the first contactor 6 and the second contactor 7 hold more than half of the outer circumference of the fuse link 8, and the opening angle α
Since the fuse link 8 is always held at an obtuse angle by its elastic force, the fuse link 8 does not fall by itself.

Next, when an attempt is made to pull out the clamped fuse link 8 from between the contacts 6 and 7, the first contact 6 has a thinner plate than the second contact 7, and the contact part 6a is longer, making it more elastic. Since the force is weak, the first contact 6 flexes more than the second contact 7, making it easier to remove the fuse link.

Subsequently, when inserting a new fuse link 8 between the first and second contacts 6 and 7, the first contact 6 is thinner than the second contact 7, and the contact portion 6a is longer. As a result, the elastic force is weak, and as a result, the first contact 6 is more easily bent outward, so that it can be inserted with a small force. After the fuse link 8 is inserted, each holding plate 9 is rotated 180 degrees from the state shown by the chain line in FIG. When the bolt 10 is tightened, the presser plate 9 presses and fixes the fuse link 8 to the contacts 6 and 7.

In this way, this invention allows the fuse link to be attached and detached with less force than the conventional fuse attachment device in which the first and second contacts have the same elastic force.

Note that this invention is not limited to the above embodiments, and may be arbitrarily modified without departing from the spirit of this invention, such as integrating the first contact and the second contact at their base ends. is also possible.

Effects As detailed above, this device uses both contacts to hold more than half of the outer circumference of the fuse link when the presser plate is removed, and its elastic force holds the fuse link so that the opening angle is always obtuse. In order to
Even if the fuse link is located downward when it is opened when installed in the cubicle, the fuse link is restricted downward by the tip of the long contact, and at the same time, the short contact that covers the outer periphery of the fuse link The fuse link is restricted in the left-right direction by the opening angle, and is securely held at the obtuse angle of the opening, so that the fuse link will not fall off by itself.

Furthermore, when the fuse link is pulled out from between both contacts, one contact is formed long and its elastic force is weaker than the other contact, so the long contact flexes more than the short contact. flex, pull the fuse link diagonally downward from the tip of the short contact to the long contact, push the long contact outward, and spread the gap between the tips of both contacts to the diameter of the fuse link. It can be removed. On the other hand, when a fuse link is inserted between both contacts, since the elastic force of a long contact is weak, it bends outward more than a short contact, and can be easily inserted with a small force. Therefore, when replacing a fuse, especially when the fuse attachment device is in a downward position, the fuse link is temporarily fastened, making the work easier.Fuses can be easily attached and detached without requiring any force. It has the excellent effect of improving the efficiency of fuse replacement work, and is an excellent idea for industrial use.

[Brief explanation of drawings]

Figure 1 is a front view of an air switch that embodies this idea, Figure 2 is a right side view, Figure 3 is a right side view of the open circuit from the state shown in Figure 2, and Figure 4 is a diagram showing the main points. FIG. 5 is a perspective view, FIG. 6 is an exploded perspective view, and FIG. 7 is a side view of the second contact. Fuse mounting base...4, First contact...6, Second contact...7, Holding plate...9, Fuse mounting device...11, 13, Fuse link contact portion...6
a, 7a.

Claims (1)

[Scope of utility model registration request] Fuse mounting device 1 provided so as to wrap around the outer periphery of fuse link 8 provided on fuse mounting base 4
1, a pair of contacts 6 and 7 facing each other so that a fuse link 8 can be clamped, one end is removable from the tip of one contact 7, and the other end is connected to the other contact 6.
and a retaining plate 9 which can be tightened with screws, and one of the pair of contacts 6, 7 is formed into an arc shape longer than the other, and both contacts 6, 7 close half of the outer circumference of the fuse link 8. or more, and
The angle α formed between the tips of the contact parts of both contacts 6 and 7 that contact the fuse link 8 and the axis of the sandwiched fuse link 8 is an obtuse angle, and the bisector n of the angle α is the fuse link. Vertical line m to mounting base 4
A fuse mounting device characterized by being offset from the