JPS5850585Y2 - Circuit breaker movable piece mounting mechanism - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting mechanism for a movable piece in a circuit breaker.

Conventionally, in a circuit breaker, a movable piece that opens and closes a main circuit has its base end fixed together with a return means, such as a leaf spring, by tightening it with a screw.

However, as described above, the work of tightening the movable piece and the leaf spring together with screws is extremely complicated, and furthermore, after repeated use, the screws may become loose, resulting in deterioration of characteristics and the possibility that the movable piece may fall off. .

Therefore, by integrally providing a support portion 1 as shown in FIG. 1 in the case of the circuit breaker, and inserting the movable piece 3 into this support portion 1 according to the procedure shown in FIGS. 2a to 2C, the movable piece 3 can be moved. It is also conceivable to mount it rotatably.

In this case, there is no need to perform the screw-locking work, and there is no need to worry about deterioration of the characteristics. Therefore, there is a risk that the conductive wire 5 may break or the solder may crack.

Further, when the movable piece 3 operates, the front wall 2 of the support portion 1 and the notch 4 of the movable piece 3 come into sliding contact, so there is a risk that the movable piece 3 may malfunction due to the friction.

The present invention was developed in view of the above problems, and provides a movable piece mounting mechanism for a circuit breaker that does not apply any unreasonable force to the conductor when the movable piece is attached, and prevents the movable piece from malfunctioning due to friction. The purpose is to provide.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings, which are examples of the present invention.

3 to 6 show an earth leakage breaker, in which 10 is a case integrally molded from synthetic resin, 15 is a cover, 17 is an operating knob, 33 is an electromagnet, and 35 is a zero-phase current transformer.

The center shaft 17a of the operating knob 17 is held by a frame 18, and is always urged clockwise around the shaft 17a by a return spring 19.

Further, one end of a U-shaped arm 20 constituting a link mechanism is rotatably attached to the eccentric position of the operating knob 17, and the other end of this arm 20 is swingable and can be lowered along the long groove 18a of the frame 18. A lever 21 is pivotally supported.

Reference numeral 22 denotes a substantially T-shaped sliding plate that can move up and down along a vertical groove 10a provided in the case 10, and this sliding plate 22 has a movable piece 23.2 that is urged upward by a return spring 25.25.
4, the protrusion 18 of the frame 18
The position is restricted by b.

The movable pieces 23 and 24 have movable contacts 23 a and 2 at their tips.
4a, with notches 23b, 24 on both sides near the base end.
b, a protrusion 23C cut upward in the center of the warp;
24C, respectively, and supports 11.11 of the case 10.
The base end portion is supported rotatably and vertically movably.

That is, a protruding wall 12 of one shape is provided protruding from the supporting portion 11 of the case 10 in opposite directions on both sides so that the width of the movable piece 23, 24 is small, and the horizontal portion 12a of the protruding wall 12
The upper surface of the proximal end of the movable piece 23, 24 is supported on the lower surface,
Further, a protrusion 12b protruding from the lower surface of the horizontal portion 12a is fitted into the cutout portions 23b and 24b of the movable piece 23.24.

Further, the sliding plate 22 is in contact with the upper surface of the movable piece 23.24 and the tip side of the protrusions 23C and 24C, so that the sliding plate 22 is in contact with the top surface of the movable piece 23.
24 is restricted from moving toward the tip.

The main circuit conductor 26 is connected to the base end of one movable piece 23 by spot welding or soldering, and the test circuit lead wire 27 and the main circuit conductor are connected to the base end of the other movable piece 24. The conductive wire 26 and the lead wire 27 are integrally spot welded or soldered.
is led out from between the vertical portions 12C of the projecting wall 12 of the support portion 11.

When attaching the movable piece 23, 24 to the support part 11, the movable piece 23, 24 is inserted into the projecting wall 12 with the conductor 26 or lead wire 27 connected to the proximal end, with the movable piece 23, 24 being held almost horizontally. The portions 23 b and 24 b may be fitted with the protrusion 12 b on the lower surface of the projecting wall 12 for temporary fixing, and the sliding plate may be pressed against the upper surface of the movable piece while the return spring 25 , 25 is slightly compressed. .

Reference numerals 28 and 29 designate a pair of load terminals, which are socket terminals, and are installed by fitting into the recess 13 at the end of the case 10. Load plugs (not shown) can be inserted from two directions perpendicular to each other through the insertion holes 14 and 16. It is now possible to do so.

One of the load terminals 28 and 29 is connected to the main circuit conductor 2.
6 is connected to the other 29, and the main circuit conducting wire 26 and the lead wire 30 are integrally connected to the other 29 with a control circuit lead wire 30 in between.

Reference numeral 31.32 is a power supply terminal whose one end also serves as a plug for insertion into the power supply, and has fixed contacts 31a and 32a on the upper surface, and connects and disconnects with the movable contacts 23a and 24a of the movable pieces 23 and 24 to connect the main circuit. Open and close.

The electromagnet 33 is fixed to a support plate 18C that is integral with the frame 18, and the armature 34 is also pivotally supported by the frame 18 and is always urged counterclockwise in FIG. 4 by a return spring (not shown).

A protrusion 34 a is formed on the back surface of the armature 34 , and the protrusion 34 a can be engaged with one end of the lever 21 .

36 is a printed circuit board 37 with a suitable transformer, diode 1,
A control circuit configured by connecting a capacitor or the like detects and amplifies a sudden change in the magnetic field of the zero-phase current transformer 35 to drive the electromagnet 33.

Reference numeral 38 denotes a test circuit contact, which is closed by pressing a test button (not shown) provided on the cover 15.

Here, the operation of the earth leakage breaker having the above configuration will be explained.

First, when the operating knob 17 in the state shown in FIGS. 3 and 4 is rotated counterclockwise against the biasing force of the return spring 19, the lever 21 is pushed down via the arm 20.

Along with this, the sliding plate 22 that engages with the lever 21 is also pushed down, and the movable piece 23.24 rotates counterclockwise using the support portion 11 as a fulcrum against the biasing force of the return spring 25.25. However, it will decline slightly.

Then, one end of the lever 21 engages with the protrusion 34a of the armature 34, stops its descent and is held at that position, and the contact point of the movable piece 23.24 is connected to the power terminal 3.
1.32 contact is contacted, the main circuit is closed, and the load circuit is energized (see Figure 5).

Next, when a leakage occurs in the load circuit, the electromagnet 33 is excited by the action of the zero-phase current transformer 35, and the armature 34 is attracted to the iron core 33H and rotates clockwise.

As a result, the lever 21 is moved to the protrusion 34 of the armature 34.
contact points 23a, 24a, 31a,
32a opens, and the main circuit is instantly interrupted.

Thereafter, the operating knob 17 is rotated clockwise by the return spring 19, and accordingly, the lever 21 is raised via the arm 20 to return to the state shown in FIGS. 3 and 4.

In the above operation, the movable pieces 23 and 24 are positioned in the front-rear direction by the contact between the vertical portion 12C of the protruding wall 12 and the base end of the movable piece and the contact between the protrusions 23C and 24C and the sliding plate 22. and are positioned in the left-right direction by side walls 40 and 41 and 42 and 43 (see FIG. 3) of the case 10.

Therefore, the movable pieces 23 and 24 are reliably positioned without moving in the front-rear direction and left-right direction.

Note that the attachment mechanism of the movable piece according to the present invention, especially its support part, is not limited to being integrally molded with the case 10 as in the above embodiment, but may be formed separately from the case 10 from metal, for example. .

In addition, the means for positioning the movable piece in the left-right direction is not limited to the side walls 40 to 43 of the case 10, and for example, a notch that engages with the movable piece may be formed in the sliding plate 22. A boss portion that engages with the upper end of the return spring may be provided on the lower surface, and the position may be determined by the return spring 25.

Furthermore, as a protrusion provided on the upper surface of the movable piece 23.24,
The movable pieces 23 and 24 are not limited to cut and raised pieces as in the embodiment, but may be made by protruding them, or small projecting pieces may be welded to the upper surface.

As is clear from the above explanation, according to the present invention, the proximal end of the movable piece is supported by a protruding wall of one shape, and the position of the protrusion on the upper surface of the movable piece is regulated by a sliding plate. When installing on a projecting wall with the conductor connected to the movable piece, there is no need to insert the movable piece vertically, so there is no need to apply excessive force to the conductor, and there is no need to worry about it breaking or disconnecting. .

Moreover, since the projecting wall does not have anything equivalent to the conventional front wall, when the movable piece moves, there are very few parts that come into sliding contact with the movable piece, and there is no fear that the movable piece will malfunction due to friction.

Note that since the above-mentioned projecting wall does not have anything equivalent to the conventional front wall, it is not possible to temporarily fix the movable piece to the case. By fitting the notch of the movable piece into the protrusion, the movable piece can be temporarily fixed, and assembly and operation can be facilitated.

[Brief explanation of drawings]

Figure 1 is a perspective view of a conventional movable piece mounting mechanism, Figure 2a, l)
, C is a cross-sectional view showing the installation order, FIG. 3 and the following show the present invention, FIG. IV in Figure 3
-IV line sectional view, FIG. 5 is a sectional view taken along IV-IV line of FIG. 3 when the main circuit is closed, and FIG. 6 is a partially perspective view. 10... Case, 11... Support part, 1
2...Protruding wall, 12 a...Horizontal part, 1
2 b...Protrusion, 12 C...Vertical part, 15...Cover, 17...Operation knob, 23.24...Movable piece, 23 a, 24
a...Movable contact, 23 b, 24 b...
...Notch, 23C, 24C...Protrusion,
26... Lead wire for main circuit, 27... Lead wire for test circuit, 28.29... Load terminal,
30...Lead wire for control circuit, 31.32...
...Power terminal, 33...Electromagnet, 35...
...Zero-phase current transformer, 36...Control circuit, 38
...Test circuit contact.

Claims (1)

[Scope of utility model registration request] A movable piece has a movable contact at its tip, a main circuit conductor is connected to its base end, and a protrusion on its top surface, and a movable piece with a protrusion on the top surface, and a movable piece with a movable piece that faces from both sides and whose spacing is greater than the width of the plate of the movable piece. A one-shaped protruding wall that protrudes so as to be small, a return spring that always urges the movable piece upward, and a sliding member that is always in pressure contact with the upper surface of the movable piece and moves up and down in conjunction with the operation knob. It consists of a plate and a means for positioning the movable piece in the left-right direction, the upper surface of the proximal end of the movable piece is supported by the lower surface of the horizontal part of the projecting wall, and the conductor connected to the proximal end of the movable piece is protruded. A movable piece mounting mechanism for a circuit breaker, characterized in that the movable piece mounting mechanism is led out from between vertical parts of a wall, and a sliding plate is positioned on the tip side of a protrusion of the movable piece.