JPS60148028A - Circuit breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a circuit breaker, and particularly to an improvement in its push-open mechanism.

[Prior art]

Conventionally, this type of circuit breaker has been constructed as shown in FIGS. 1 to 3. Figure 1 shows the OF. In the figure, (1) is a base made of insulating material, (2) I/'i
A handle rotatably supported around a shaft (101) which is a part of this base (1), (3) Id with a torsion spring attached to the shaft (101), one end of which is connected to the base (101); Hang the other end of (1) on the above handle (2),
It urges the handle (2) counterclockwise. (4) is formed into a U-shape, and one leg is at the inner end (201) of the handle (2)! @! A U-pin or link, (
5) is a latch having a hole (not shown) into which the other leg of the U pin (4) is rotatably inserted; (7) a
A movable element is connected to the latch (5) by a shaft (6), and a central portion of the movable element (7) is rotatably supported by a shaft (8) supported by the base (1). There is. (9
) is a lever rotatably supported by the shaft (8), and normally the hole at one end (901) is connected to the latch (
5). (10) is the movable member (7)
), and (11) is a torsion spring wound around this shaft (lO), one end of which is hooked to the shaft (8) and the other end to the lever (9). Lever (9
) in the counterclockwise direction. (12) rI
i A movable contact fixed to one end of the movable element (7), (
13) is the shaft attached to the base (1), (14)
is a tension spring stretched between this shaft (13) and the above-mentioned shaft (lO), (15) #- is a stator fixed to the above-mentioned base 111, and (16) is a tension spring so as to face the above-mentioned movable contact (12). a fixed contact (17) fixed to the stator (15);
has one end electrically connected to the stator (15),
The other end of the coil is electrically connected to the flexible copper stranded wire (18), (19) #- is connected to the flexible copper stranded wire 1 [1 (18)
K With electrically connected terminals, knead (20) and terminal (
21) Connects the K-type external conductor (not shown). (22) is a yoke that is attached to the base (1) and forms a magnetic path; (23) Fi resists the spring force of the push spring (24) when the coil (17) is excited; [The pulled plunger (25) is the coil (1)
7) is a wound bobbin, and the plunger (23) is loosely fitted into the hollow part of the bobbin. (26) is the rond 1. which is driven to the left when the plunger (23) is sucked. (27) is an insulating tube attached to the flexible copper stranded wire (18), (28) is an insulating barrier that insulates and isolates the yoke (22) and the arc extinguishing chamber (42), which will be described later;
) is a flexible copper stranded wire whose one end is electrically connected to the mover (7), (30) is a bimetal whose other end is electrically connected to the flexible copper stranded wire (29), and ( 31) is a terminal to which one end of this bimetal (30) is fixed.
32) and a terminal (33) to connect an external conductor (not shown). (34) is the above bimetal (30)
(35) is an insulating tube attached to the above-mentioned flexible copper stranded wire (29); (36) has one end fixed to the terminal [31], and the other end fixed to the above-mentioned flexible copper stranded wire (29); It is fitted into the groove of the base (1). (37) is an insulating barrier interposed between the base (1) and the arc runner (36); The side plate made of inorganic material (40) is the base (1) K
It can be attached to a rail (not shown) with a single touch using the provided mounting brackets. (41) li No. 10 #a is hooked to the base (1), and the other end suppresses the mounting bracket (40) to the right. (42) is supported by a pair of side plates (44) so as to be in contact with each other.

(45) Li arc discharge barrier.

Next, the operation of a conventional circuit breaker will be explained.

That is, when the handle (2) is rotated clockwise (Oa operation) from the OFF state of the circuit breaker shown in FIG.
The movement of 2) is via the U pin (4) and latch (5), and the shaft (
6) to the movable element (7), the movable element (7) rotates counterclockwise around the shaft (8), and the movable contact (12
) is welded to the fixed contact (16). Furthermore, the handle (2
) rotates, the shaft (8) moves slightly into the groove formed in the base (1) K, so the toggle formed by the inside 111fil (201) of the noddle (2) and the U pin (4) The linkage extends beyond the dead point,
This series of ON operations is completed by locking the inner end (201) of the handle (2) to the base (1), resulting in the situation shown in FIG. 2.

Note that the contact pressure between the movable contact (12) and the fixed contact (16) is generated by the tension spring (14). Next, it is released from the toggle link machine fixed contact (16) formed by the end (201) and the U-bin (4) in Fig. 2, and the OFF switch shown in Fig. 1 is released.
state. Next, when a relatively small overcurrent such as an overload current flows, the bimetal (30) bends due to its own Joule heat generation, and the adjustment screw (34) provided at the tip of the bimetal (30) Press the lever (9), the lever (9) rotates clockwise around the shaft (8), and the latch (5) and lever (9) are disengaged. Therefore, the movable element (7) rotates clockwise around the shaft (8) due to the biasing force of the tension spring (14), and the movable contact (12) is separated from the fixed contact (16), as shown in FIG. The instantaneous trip state occurs as shown in . After that, the latch (5) is pushed through the handle (2) and the U pin (4) by the biasing force of the tension spring (3).
) rotates clockwise around the shaft (6), and the latch (
5) is locked to the lever (9), which is the same as the OFF state shown in FIG. Note that the above trip is performed with a time delay characteristic. On the other hand, when a large overcurrent such as a short circuit current flows, the coil (17) is excited and the plunger (
23) is attracted against the biasing force of the push spring (24), the rond (26) is pushed out, and the lever (9) is moved against the shaft (8).
) in the clockwise direction, and the launch (5) and lever (
9) becomes unlatched. Then, if due to overload current! : It operates in the same way and trips. Note that this trip is performed with instantaneous characteristics. However, since conventional circuit breakers have a latch (5), the opening/closing mechanism is complicated, making assembly difficult and expensive. Because the mechanism is complex, the time from the occurrence of a short circuit to the opening of the contacts (contact opening time) is long, and the ability to interrupt short-circuit current (interrupting capacity) cannot be improved much.

[Summary of the invention]

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by eliminating the latch member and holding the @ part of the link between the movable element and the locking lever, the breaking performance can be improved. The purpose of the present invention is to provide an inexpensive circuit breaker that can be used between structures.

[Embodiment of the Invention] An embodiment of the invention will be described below with reference to the drawings. Fourth
7 to 7 all show one embodiment of the present invention. FIG. 4 shows its 0Fli'' state, FIG. 5 shows its ON state, and FIG. 6 shows its state at the moment of tripping. 7 is an exploded perspective view showing the main parts. In the figure, (46) is rotatably pivoted by the shaft (8) supported by the pace (1). In the supported movable element, one rotating end has a pair of first and second latch surfaces (
46aX46b), and is disposed at the other rotating end facing the fixed contact (16).
2).

The shaft (l) attached to the movable element (46)
O) The above-mentioned shaft (13) attached to the seventh above-mentioned pace (1)
The movable contact (12) is constantly biased in a direction in which the movable contact (12) is separated from the fixed contact (16) by the tension spring (14) stretched over the movable contact (12). (47) is a locking lever rotatably supported on the movable element (46) by the shaft (8);
A torsion spring (48) wound around the shaft (8) always biases the mover (46) in a direction opposite to the biasing direction, and normally both the latch surfaces (46a) (46b)
A locking part (47) that clamps the other end of the upper distribution bottle (4)
The present invention will now be described in detail. That is, in both the 0FIi' state of the circuit breaker shown in FIG. 4 and the ON state of the circuit breaker shown in FIG. ) and the locking portion (47a) of the locking lever (47).

When the handle (2) is turned clockwise (ON operation) from the OFF state of the circuit breaker shown in Fig. 4, the handle (2)
I7? The toggle link mechanism formed by the inner end (201) and the U-pin (4) extends beyond the dead point,
The movable element (46) rotates counterclockwise around the shaft (8), the movable contact (12) contacts the identification contact (16), and the fifth
The situation shown in the figure is bad. Next, when the handle (2) is rotated to the left (OFF operation), the inside 11 of the handle (2)
! The toggle link mechanism formed by (201) and U pin (4) bends beyond the dead point, and the 5'f# child (
46) rotates clockwise about the shaft (8), and the movable contact (12) is separated from the fixed contact (16), resulting in the OFF state shown in FIG. Next, when a relatively small overcurrent such as an overload current flows, the bimetal (30) bends due to its own Joule heat generation, and the bimetal (30) bends due to its own Joule heat generation.
) The adjustment screw (34) provided at the tip of the locking lever (
47), the locking lever (47) rotates clockwise around the shaft (8), releases the grip on the other end of the U-pin (4), and uses the urging force of the spring (14) to release the grip on the other end of the U-pin (4). The movable element (46) rotates clockwise around the shaft (8), and the movable contact (12) is separated from the fixed contact (16), resulting in a tri-blink state as shown in Fig. 6. The handle (2) then rotates counterclockwise due to the biasing force of the tension spring (3), and the U
The other end of the bottle (4) is located between both latch surfaces (46a) (46b) and the locking part (47a), and the U-bin (4) is located between both latch surfaces (46aX4'6b) and the locking part. (47a), and the state is similar to the OFF state shown in FIG. On the other hand, when a large overcurrent such as a short circuit current flows, the coil (17) is excited and the plunger (23) is pressed by the spring (
24), the rond (26) is pushed out, the locking lever (47) rotates clockwise about the shaft (8), and the other end of the U-bin (4) is pushed out. Release the grip.

After that, the circuit operates in the same way as when it is caused by overload current and trips. In the event of a trip due to such an overcurrent, the mover (46) of the main
Since there is no launch (5) compared to the conventional type, the contact opening time (time from the occurrence of a short circuit to the opening of the contact) is shortened, so the short circuit current can be quickly reduced. This will improve the cutting performance. In addition, in the present invention, the latch (5) and the shaft (
6) is not required, so the structure is simplified. Regarding the length, the conventional type has the U pin (4) inserted into the hole of the latch (5), and the shaft (6) inserted into each hole of the mover (7) and the launch (5).
), but as is clear from FIG. 6, this is not necessary for the "zero-start" model, which enables automatic assembly and can be manufactured at low cost.

In addition, in the above embodiment, a U-bin (4) formed in a U-shape was provided as the link (4), but a shape other than the U-bin may be used, and the link (4) may have a shape similar to the above embodiment. It has the following effects.

〔Effect of the invention〕

As described above, according to the present invention, since the movable element is directly connected to the link, the contact opening time is shortened, so that the breaking performance can be improved. Furthermore, since the structure is simple and automatic assembly is possible at 0J', it is possible to obtain a circuit breaker that can be manufactured at low cost.

[Brief explanation of the drawing]

Figures 1 to 3 all show conventional circuit breakers; Figure 1 is a side sectional view showing its OFF state, Figure 2 is a side sectional view showing its ON state, and Figure 3 is a side sectional view showing its ON state. It is a side sectional view showing the state at the moment of tripping. Figures 4 to 7 all show an embodiment of the present invention, with Figure 4 being a side sectional view showing its O and FF states, and Figure 5 being its O
FIG. 6 is a side sectional view showing the N state, FIG. 6 is a side sectional view showing the state at the moment of tripping, and FIG. 7 is an exploded perspective view showing the main parts. In the figure, (2) is the operation nondle, (4) is the link, (1
2) is 0J' moving contact, (16) is 161 constant contact, (46
) is the mover, (46a) and (46b) are the latch surfaces, and (47
) is a locking lever, and (47a) is a locking portion. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1 Figure 2 Figure 2 Figure 3 Figure 4 Figure 5 Figure 2 Figure 6 Procedural amendment (voluntary) May 1980 Office 1 Day 2 Name of the invention Circuit breaker; 3. To the person making the amendment Representative Hitoshi Katayama Part 5, Subject of amendment (1) Claims column of the specification (2) Drawing 6, Contents of amendment (1) The scope of claims in the specification should be posted on a separate sheet. Correct as expected. (2) Attach the drawing Figure 4. Street code "19J" in Figure 4
Corrected to '12J. (3) The symbol '20° in Figure 5 of the drawing is corrected to '201' as indicated in red in attached Figure 6. Claims (1) One end is rotatably connected to the operating handle, and the upper N
e A link that forms a toggle link mechanism together with the operating handle, is rotatably supported, has a latch surface at one rotating end, and is arranged opposite to a fixed contact at the other rotating end and is movable. a movable element having a contact and in which the movable contact is biased in a direction in which the movable contact is separated from the fixed contact; A locking lever is provided with a locking portion that is arranged and always biased in the direction of the latch surface, and the other end of the link is normally held between the latch surface and the locking portion, and the operation handle is used to operate the locking lever. Both contacts are disconnected, and an overcurrent exceeding a specified value flows.
The circuit breaker is characterized in that when the upper P locking lever is operated to release the clamping, both the contacts are opened. (2) The circuit breaker according to claim (1), wherein the link is constituted by a U-shaped pin. Figure 4, ':1 Figure

Claims (1)

[Scope of Claims] A link that is rotatably connected at one end to the operating handle and forms a toggle link mechanism together with the operating handle; a movable element having a movable contact disposed opposite to a fixed contact at the other rotating end of the movable element, the movable element being constantly biased in a direction in which the movable contact is separated from the fixed contact; A locking lever is rotatably supported on the movable member and has a locking portion at one rotating end facing the latch surface and always biased in the direction of the latch surface. The other end of the link is clamped between the latch surface and the locking part, and the operating handle connects and separates the contacts, and when an overcurrent of more than a predetermined value flows, the lock is released so as to release the clamp. A circuit breaker characterized in that a stop lever operates to open and separate both of the contacts. (2) The circuit breaker 1 according to claim (1), characterized in that the link is constituted by a U-shaped pin.