JPS6237308Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a switching device that connects and separates a movable contact connected to a flexible lead wire and supported by a pin from a fixed contact, and the width of the contact surface of the pin to the movable contact is The width is made smaller than the width of the contact surface of the movable contact against the fixed contact, thereby preventing uneven contact between the movable contact and the fixed contact and stabilizing the contact.

In general, switching devices such as wire breakers and switches that connect and separate a movable contact connected to a flexible lead wire from a fixed contact are shown in Figures 1 to 3.
It is configured as shown in the figure.

That is, in the figure, 1 is an upright insulating plate, 2 is a horizontal fixed contact that is attached to the upper part of the insulating plate 1 via a fixture 3 and penetrates the insulating plate 1, and 4 is a fixed contact on the insulating plate 1. A supporting metal fitting installed on the right side and having a planar inverted U-shape with support pieces 4' on both sides protruding to the right; 5 is an approximately L-shaped current-carrying conductor passing through the lower part of the insulating plate 1; 6 is a flexible lead wire. The supporting metal fitting 4, the current-carrying conductor 5, and one end of the flexible lead wire 6 are integrally attached to the insulating plate 1 with bolts and nuts 7. 8 is a fixed firing contact provided on the upper surface of the fixed contact 2, and 9 is an arcing horn integrally provided on the upper surface of the fixed firing contact 8.

Reference numeral 10 indicates a support pin provided integrally between the tips of both support pieces 4' of the support fitting 4, and reference numeral 11 indicates two support pins rotatably supported by the support pin 10 and located inside each of the support pieces 4'. The mounting bracket includes a rotating pin 12 provided between the upper ends of both mounting brackets 11, and a movable contact 13 inserted through and supported by the rotating pin 12 and connected to the other end of the flexible lead wire 6. , this becomes the main contact, and as the mounting bracket 11 rotates, the upper contact surface 13' of the movable contact 13 approaches and separates from the right end contact surface 2' of the fixed contact 2. 14 is a spring pin fixed between the upper right ends of both mounting brackets 11; 15 is a main contact tension spring stretched between the spring pin 14 and the lower end of the movable contact 13; 16 is the rotation pin 1;
2, the upper contact part 16' contacts and separates from the fixed arcing contact 8; 17 is the spring pin 1;
4 and the lower end of the arc contactor 16; 18 is a tension spring for arc contact;
The stopper pin 19 of the movable contact 13 and the arc contact 16 is provided between the center portions of the two mounting brackets 11, and 19 is an operating pin provided between the lower right ends of both mounting brackets 11, which is the operating bracket of the opening/closing operation mechanism (not shown). The tip of the mounting bracket 20 is connected to an operating pin 19, and both mounting brackets 11 are rotated via the operating pin 19 when the operating bracket 20 is moved up and down. Reference numerals 21 and 22 denote disconnection contacts attached to respective ends of the fixed contact 2 and the current-carrying conductor 5 led out from the left side surface of the insulating plate 1.

When the closing operation is performed from the shrunk state shown in FIG. 2, when the operation fitting 20 is operated upward by driving the opening/closing operation mechanism, both mounting fittings 11 move counterclockwise with the support pin 10 as a fulcrum. rotated,
The rotation pin 12 supported between both mounting fittings 11 also rotates counterclockwise. At this time, rotation pin 1
The movable contactor 13 and the arc contactor 16 supported by the movable contactor 2 and the arc contactor 16 move together with the rotation of the mounting brackets 11 with their lower ends in contact with the stopper pin 18 by the urging of the tension springs 15 and 17, respectively. As the rotation of both mounting brackets 11 progresses, first, the arc contact 16, which has a long distance from the rotation pin 12 to the contact portion 16', connects its contact portion 16' to the contact surface of the fixed arcing contact 8. contact, and further, due to the subsequent rotation of both mounting brackets 11, the stopper pin 18 separates from the lower end of the arc contactor 16, and the arc contactor 1
6 is brought into contact with the fixed firing contact 8 with contact pressure due to the spring force of the arc contact tension spring 17, and the movable contact 13 having a short distance from the rotating pin 12 to the contact surface 13' is brought into contact with the fixed firing contact 8. The contact surface 13' is brought into contact with the contact surface 2' of the fixed contact 2, and a predetermined electrical circuit is formed, that is, the disconnection part contact 21, the fixed contact 2, the movable contact 13, the flexible lead wire 6, the current-carrying conductor 5, and the disconnection. An electric path for the contactor 22 is formed. This movable contact 1
3, both mounting brackets 11 rotate a little, and this rotation causes the stopper pin 18 to separate from the lower end of the movable contact 13, and as shown in FIGS. 1 and 3, the movable contact 13 The fixed contact 2 is contacted with a contact pressure by the main contact tension spring 15, and a predetermined contact pressure is obtained for each of the arc contact 16 and the movable contact 13.

In addition, when performing the shedding operation from the above-mentioned closed state, the operating fitting 20 is moved downward by the opening/closing operation mechanism, and both mounting fittings 11 are rotated clockwise using the supporting pin 10 as a fulcrum via the operating pin 19. First, the stopper pin 18 comes into contact with the lower end of the movable contact 13 when both the contacts 13 and 16 are in contact, and then the movable contact 13 rotates together with both the mounting brackets 11 while being in contact with the stopper pin 18. , its contact surface 13' separates from the contact surface 2' of the fixed contact 2. Furthermore, as the mounting bracket 11 rotates thereafter, the stopper pin 18 also comes into contact with the lower end of the arc contactor 16, and by rotating the mounting bracket 11 in this state, the contact portion 16' of the arc contactor 16 is fixed. It separates from the firing contact 8 and enters the shriveled state shown by the two-dot chain line in FIG. 1 and in FIG. 2.

By the way, in this type of conventional switchgear, as shown in FIG. The moving pin 12 is connected to the support hole 23
The movable contact 13 is rotatably supported. At this time, the rotation pin 12 during the closing operation
The width of the contact surface of the movable contact 13 against the support hole 23 and the width of the contact surface of the movable contact 13 against the fixed contact 2 are the contact surface 13'
It is formed equal to the width of.

However, according to the conventional device, if the rotary pin 12 is not parallel to the contact surface 2' of the fixed contact 2 due to variations in component processing, the movable contact 13 is turned on when it is turned on, as shown in the figure. This is inconvenient because it hits the fixed contact 2 unevenly, increasing contact resistance, and not only lowering the current carrying performance but also causing overheating.

This invention takes the above points into consideration, and the pivot pin 12
The width of the contact surface to the movable contact 13 of the movable contact 1
3, smaller than the width of the contact surface to the fixed contact 2,
This invention is intended to eliminate the drawbacks of the conventional invention, and next, this invention will be explained in detail with reference to FIG. 5 showing one embodiment thereof.

In FIG. 5, the same symbols as above indicate the same things, and the difference is that the support hole 24 for inserting the rotation pin 12 provided through the movable contact 13 is replaced by an insertion portion 24a of the same diameter in the center. and a mortar-shaped expanded portion 24b that communicates with both ends of the insertion portion 24a. This is due to the fact that it is formed smaller than the width of the surface. Now, the width of the contact surface of the rotating pin 12 against the movable contact 13 at the time of closing, that is, the width of the insertion part 24a of the support hole 24, is l ₁ , and the contact surface of the movable contact 13 with the contact surface 2' of the fixed contact 2 is l 1 . If the width of the surface, that is, the contact surface 13' is l ₂ , then l ₁ <l ₂ .

Therefore, due to variations in parts processing, etc.
Even if the rotating pin 12 is not parallel to the contact surface 2' of the fixed contact 2, uneven contact as shown in FIG. 4 occurs at the initial stage of the closing operation, but the support hole 2
The width l ₁ of the insertion portion 24a of No. 4 is smaller than the width l ₂ of the contact surface 13' of the movable contact 13, and the swing of the movable contact 13 relative to the rotation pin 12 can be formed in both expanded portions 24b. As the rotating pin 12 is pushed in, the movable contact 13 swings relative to the rotating pin 12, and as shown in FIG.
The contact surface 13' of the contact surface 13' contacts the fixed contact 2 over the entire surface, eliminating the problem of uneven contact as in the conventional case.
It is possible to improve current conduction performance, stabilize contact, and improve reliability of the device.

In addition, in the above, the support hole 24 of the movable contact 13
Although the expanded portions 24b are formed at both ends of the support hole 24b so that l ₁ <l ₂ , the support hole 24 is not limited to this.
The inner surface of the movable contact 1 may be formed into an arc shape expanding outward, and the pivot pin 12 may be brought into point contact with the support hole 24 of the movable contact 13.
3 can swing freely with respect to the rotation pin 12, eliminating any uneven contact as in the conventional case.

As mentioned above, according to the switchgear of this invention,
The movable contact is supported by the pin of the mounting bracket, and a fixed contact is provided that allows the movable contact to move toward and away from the movable contact by rotation of the mounting bracket, and the width of the contact surface of the pin to the movable contact is By making the width smaller than the width of the contact surface to the fixed contact, it is possible to form a swing width for the movable contact with respect to the pin.
Even if the pin is not parallel to the contact surface of the fixed contact due to variations in parts processing, pressing the pin during insertion can eliminate uneven contact between the movable contact and the fixed contact, and the movable By effectively utilizing the entire contact surface of the contact, it is possible to reduce contact resistance and prevent overheating, as well as improve current conduction performance and stabilize contact, thereby improving the reliability of the device.

[Brief explanation of the drawing]

Figures 1 to 3 show general switching devices,
Figure 1 is an overall sectional view of the closed state, Figures 2 and 3 are partial sectional views of the closed state and closed state, respectively, and Figures 4 and 5 are 3rd views of the switchgear, respectively. 4 shows a conventional example, and FIG. 5 shows an embodiment of this invention. 2...Fixed contact, 11...Mounting bracket, 12...
...Rotating pin, 13...Movable contact, 13'...Contact surface.

Claims (1)

[Scope of utility model registration request] A pin is provided on the rotatably supported mounting bracket,
A movable contact connected to a flexible lead wire is inserted into and supported by the pin, and a fixed contact is provided that allows the movable contact to move toward and away from the movable contact by rotation of the mounting bracket, and the movable contact of the pin A switchgear in which the width of a contact surface of the movable contact that contacts the fixed contact is smaller than the width of the contact surface of the movable contact that contacts the fixed contact.