JPS6146929B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a breaker and is particularly directed to an improvement in the opening/closing portion thereof.

FIG. 1 shows an example of the configuration of a normal edge breaker, with the edge breaker in a closed state. Here, 1 is a switch or a disconnector, and includes an opening/closing part 4 including a movable contact 3 that opens and closes relative to the fixed contact 2, and an operating part 6 including a handle 5 that operates the opening and closing operations of the movable contact 3. It includes a movable iron piece 9 that is attracted to the electromagnetic coil section 7 and the suction plate 8 of the coil section 7, and when an overcurrent is conducted, the overcurrent puller opens the opening/closing section 4 and the operation section 6 to break the circuit. It has a removal part 10. Although FIG. 1 shows a cutting mechanism with only one pole, in general, the above-mentioned operating section 6
A plurality of mechanisms consisting of the opening/closing part 4 and the overcurrent tripping part 10 except for The opening/closing parts 4 of the poles are connected by an opening/closing shaft 41 so that each pole can be opened and closed simultaneously.

In the breaker 1 shown in the first diagram, current flows from a fixed contact 2 connected to the power supply side, a contact 21 fixed to the fixed contact 2, a contact 31 fixed to the movable contact 3 and in contact with the contact 21, Movable contactor 3, lead wire 32 connected to movable contactor 3, lead wire 33 connected from lead wire 32 to electromagnetic coil section 7, electromagnetic coil section 7, lead wire 71 connected to coil section 7
It flows to the load-side terminal board 12 through the. When an overcurrent flows through this shield breaker 1, the movable contact 3 of the opening/closing part 4 rotates clockwise around the opening/closing shaft 41 due to the operation of the tripping device 10, and the contact 21 and the contact 31 rotate clockwise around the opening/closing shaft 41. By opening the circuit, the circuit is briefly broken.

FIG. 2 shows details of the opening/closing part 4 shown in the first diagram, where 41 is the opening/closing shaft mentioned above, and the opening/closing shaft 41 is
Both ends of the sheath breaker 1 are pivotally supported on bearings (not shown) attached near the side walls of the exterior of the sheath breaker 1. The opening/closing shaft 41 is provided with a square prism-shaped holder fixing part 42 corresponding to each of the above-mentioned chambers, and a holder 43 is fixed to the holder fixing part 42. The holder 43 has a bifurcated arm portion 43.
A, a shaft pin 45 is inserted into the tip of the arm portion 43A, and the movable contact 3 is pivotally supported by this shaft pin 43. Here, when the movable contact 3 maintains the state shown in the second diagram, that is, the closed circuit state with the fixed contact 2, the contact 31 is applied to the contact 21 with a predetermined contact pressure and a predetermined contact area. It is desirable to make contact with

FIG. 3 shows a conventional example for bringing the contact 31 into contact with the contact 21 with a predetermined contact pressure.
Insert the shaft pin 45 into the torsion spring 46 and tighten the spring 4.
One end 46A of 6 is attached to the arm 43 of the holder 43.
The hook portion 46B at the other end of the spring 46 is bent into a U-shape on a locking plate 43B protruding between the holes A and 43B, and the hook portion 46B at the other end of the spring 46 is locked to the movable contact 3 to obtain a desired contact pressure. There is. However, when the movable contact 3 is biased toward the fixed contact 2 by the torsion spring 46 shown in FIG. As shown in FIG. 4, the torsion spring 4
Due to the unique characteristics of the shaft pin 45, it is also biased counterclockwise in a plane that includes the shaft center of the shaft pin 45.

Figure 5 shows the characteristics specific to the torsion spring TS,
When a torque is generated in a direction perpendicular to the axis of the axis AX from the state before torque generation (dotted line), it is deformed as shown by the solid line, and a counterclockwise direction is generated in the plane that includes the axis of the axis AX. Torque is generated. Therefore, the fourth
As shown in the figure, in the closed circuit state of the breaker,
The contact 31 cannot make contact with the center of the contact 21, resulting in a reduced contact area and poor contact reliability.

Figure 6 shows that in order to eliminate such drawbacks,
The movable contact 3 is located at the center of the bifurcated arm 43A of the holder 43, and the movable contact 3 is biased toward the fixed contact 2 by a torsion spring 46' having two torsion parts on the left and right sides. be. According to the torsion spring 46' shown in FIG. 6, even if torque is generated in a plane orthogonal to the axis of the shaft pin 45, the shaft pin
5, the torques generated in opposite directions by the left and right torsion parts are canceled out, so the movable contact 3 does not tilt in any direction, and the contact 31 is held at the desired contact pressure. , can be brought into contact with the contact point 21 with a contact area. However, the torsion spring 46' has two torsion parts and is expensive because it is complicated and takes a long time to process. The disadvantage is that it is difficult to assemble.

It is an object of the present invention to eliminate the above-mentioned drawbacks, to have a simple configuration, good assembly efficiency, low cost, and to enable contact points to be brought into contact with a desired contact pressure and contact area, and to have high contact reliability. The aim is to provide disconnectors and disconnectors.

That is, the opening/closing shaft of the present invention is rotatably supported on the side wall of the exterior of the cutter, and the holder is fixed to the opening/closing shaft and swings about the opening/closing shaft in conjunction with the operation of the operating section. , a movable contact swingably supported by the holder via a shaft pin, and a torsion spring attached to the shaft pin to apply contact pressure of the movable contact to the fixed contact. or in a disconnector, one end of the torsion spring is engaged with the movable contact, and the other end of the torsion spring is fixed so that a pre-rotation torque is generated in the torsion spring itself in a plane orthogonal to the direction of contact pressure. , is characterized in that it is locked to the holder.

The present invention will be explained in detail below based on the drawings. Below, the same parts as in FIGS. 1 to 3A and 3B are given the same reference numerals, and the explanation thereof will be omitted.

FIGS. 7A and 7B show an example of the configuration of the present invention, and as shown in FIG. It is bent at a substantially right angle, and the hook portion 50B at the other end is bent into a substantially U-shape as described above. As shown in FIGS. 7A and 7B, the shaft pin 45 is inserted into this torsion spring 50, one end 50A of the spring 50 is locked to the locking plate 43B of the holder 43, and the end 50A is cut. Face 50
A' is kept in contact with one inner wall of the bifurcated arm 43A. One end of the spring 50, ie, the hook portion 50B, is locked to the upper wall of the movable contact 3. Thus, in the present invention, in FIG. 7A, the cut surface 50A' of the torsion spring 50 is in contact with one inner wall of the arm portion 43A, so that the torsion spring 50 is in a free state as shown in FIG. Then, the end portion 50A side is biased clockwise in a plane that includes the shaft pin 45 with the shaft insertion portion 50C as the center, and a clockwise torque is generated in the torsion spring 50 in a plane that includes the shaft pin 45. are doing. Here, the movable contact 3 is urged toward the fixed contact 2 as shown by the two-dot chain line in FIG. 7B,
When the contact 31 is brought into contact with the contact 21 with a predetermined contact pressure, as explained in FIG.
Trying to bias counterclockwise in the plane containing
As mentioned above, clockwise torque is generated in this plane in advance in the torsion spring 50, so 2
The two forces cancel each other out, and the movable contact 3 comes into contact with the center of the movable contact 2 in a state substantially orthogonal to the shaft pin 45. Therefore, the contact point 31 and the contact point 21 can contact each other at their center positions, and can contact each other with a desired contact area.

FIG. 9A shows another example of the present invention, in which an eighth
A hole 52 is made into which the end 50A of the illustrated torsion spring 50 is inserted and locked. Also, holder 4
The locking plate 43B of No. 3 is provided in a protruding manner only at a position facing the movable contactor 3. End 5 of torsion spring 50
When 0A is inserted into the hole 52 of the arm portion 43A, the inner bent portion 50A'' of the end portion 50A is in contact with the end portion 52A of the hole 52, so the shaft pin 45 is inserted in the same manner as described above. A clockwise torque centering on the shaft pin 45 is applied to the torsion spring 50 in advance in a plane including the
given to. Therefore, it is possible to obtain the effect that the movable contactor 3 does not tilt when the contact is closed, as described with reference to FIGS. 8A and 8B. Further, according to the configuration shown in FIG. 9A, the ease of assembling the movable contactor 3 to the holder 43 is further improved. That is, in this example, as shown in FIG. 9A, the locking plate 43B as shown in FIGS. 7A and 7B is not provided protruding near the end 50A of the torsion spring 50. As shown in FIG. 10A, the torsion spring 50 can be attached to the shaft pin 45 and the movable contact 3 in a free state, and then, as shown in FIG. 10B, the end 50A of the torsion spring 50 is attached. What is necessary is to insert it into the hole 52 and apply an initial spring force to the torsion spring 50. Therefore, as shown in FIGS. 7A and 7B, it is not necessary to attach the torsion spring 50 to the shaft pin 45 and the movable contact 3 with an initial spring force applied thereto, thereby improving the ease of assembly.

FIG. 11 shows another example of the torsion spring in the present invention, where 55 is a torsion spring, and the arm portion 5 on the hook portion 55A side formed on the torsion spring 55
5B is slightly bent toward the other end 55C of the spring 55. When the pin 45 is inserted into the spring 55 in the same manner as described above, and the hook portion 55A of the spring 55 is further engaged with the movable contact 3, the movable contact 3 always has the page shown in FIG. A clockwise torque is applied within the plane containing the movable contact 3.
Since the counterclockwise torque generated when contacting the fixed contact 2 with a predetermined pressure is canceled out, the desired contact area and contact pressure can be obtained in the same manner as described above when the circuit is closed. .

As explained above, according to the present invention, when a torsion spring that applies contact pressure to a contact is attached to an opening/closing mechanism that includes a movable contact, the inclination of the movable contact that occurs when contact pressure is applied is Since torque is applied in advance to compensate for the torsion, the movable contact does not tilt when the contacts are in contact, and the contacts can make contact with a predetermined pressure and a predetermined contact area. High contact reliability can be obtained compared to a spring-contact switch that obtains contact pressure using a spring.

[Brief explanation of the drawing]

Fig. 1 is an internal structure diagram showing an example of the structure of the cutter and disconnector, Fig. 2 is a perspective view showing an example of the structure of the opening/closing part of the cutter and cutter shown in Fig. 1, and Fig. 3A is the illustration of the second figure. FIG. 3B is a front view thereof, and FIG. 4 is a plan view showing a state in which the movable contact shown in FIGS. 3A and B is biased toward the fixed contact. , 5th
The figure is a diagram showing the characteristics of a torsion spring, FIG. 6 is a plan view showing another example of the conventional opening/closing part, FIG. 7A is a plan view showing an example of the opening/closing part in the present invention, and FIG. 7B
8 is a diagram showing the torsion spring according to the present invention shown in FIGS. 7A and B, and FIG. 9A is a diagram showing another opening/closing part according to the present invention using the torsion spring shown in FIG. 8. FIG. 9B is a plan view showing an example, FIG. 9B is a detailed view thereof, FIGS. 10A and B are diagrams showing the assembly procedure of the opening/closing part shown in FIG. 9A, and FIG. 11 is a diagram showing the torsion spring according to the present invention. It is a diagram showing another example. DESCRIPTION OF SYMBOLS 1...Shipping disconnector, 2...Fixed contact, 3...Movable contact, 4...Opening/closing part, 5...Handle, 6...Operation part, 7
...Electromagnetic coil part, 8...Suction plate, 9...Movable iron piece, 1
0...Tripping part, 12...Terminal, 21, 31...Contact, 32, 33...Lead wire, 41...Opening/closing shaft, 42
...Square cross section, 43...Holder, 43A...Bifurcated arm, 43B...Lock plate, 45...Axis pin, 46,4
6'...Torsion spring, 46A, 46B...Spring end,
50, 55...Torsion spring, 50A, 50B, 55
A, 55C...spring end, 50A'...spring cut surface,
50A″...Spring bent part, 52...Hole, 52A...Hole end, 55B...Spring arm, TS...Torsion spring, AX...
shaft.

Claims (1)

[Scope of Claims] 1. An opening/closing shaft rotatably supported on the side wall of the exterior of the shield breaker, an opening/closing shaft fixed to the opening/closing shaft, and swinging about the opening/closing shaft in conjunction with the operation of the operating section. a holder, a movable contact swingably supported on the holder via a shaft pin, and a torsion spring attached to the shaft pin to apply contact pressure of the movable contact against the fixed contact. In the sash and disconnector, one end of the torsion spring is engaged with the movable contact,
The other end of the torsion spring is locked to the holder so that a pre-rotation torque is generated in the torsion spring itself in a plane orthogonal to the direction of contact pressure. 2. In the shear disconnector according to claim 1, the torsion spring has a hook part that engages the movable contact, a spring torsion part, and an end part on the opposite side of the hook part. an arm whose end portion is substantially orthogonal to the axis of a shaft insertion portion formed in the twisted portion;
and a bent portion in which the arm is bent outward from the twisted portion in the axial direction. 3. In the shear disconnector according to claim 2, the end of the torsion spring on the side opposite to the hook part is brought into unrotatable contact with the locking plate of the holder at the bent part, and the bent part 1. A shear breaker, characterized in that a tip end surface of the holder is brought into contact with an inner wall surface of the bifurcated arm portion of the holder with a preload force. 4. In the shear cutter according to claim 2, the bending portion is inserted into a through hole of the holder portion to engage one end of the torsion spring. Features: Shiya disconnector.