JPH0641325Y2 - Circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a circuit breaker, and more specifically, a toggle link mechanism including an operating handle and a link, and a movable element and a link are disengaged. The present invention relates to a circuit breaker provided with a locking lever and an overcurrent tripping means.

[Conventional technology]

Conventionally, this type of circuit breaker is constructed as shown in FIGS. 2 and 3. Fig. 2 shows the OFF state, Fig. 3 shows the main part, (1) is a base made of insulating material,
(2) is a handle rotatably supported around a shaft (101) formed by a part of the base (1), and (3) is a shaft (10).
A torsion spring mounted on 1) hangs one end on the base (1) and the other end on the handle (2) to bias the handle (2) counterclockwise.

(4) is U-shaped and one leg has a handle (2)
A link made of a U pin rotatably inserted into a hole (not shown) provided at the inner end (201) of the base (5) is supported by the oval hole (102) of the base (1). A mover rotatably supported by a shaft (6), and has a pair of first and second latch surfaces (5a) and (5b) at one of the turning ends.
Reference numeral (7) is a locking lever rotatably supported on the mover (5) by the shaft (6), and the mover (5) is provided by a twist spring (8) wound around the shaft (6). It is always urged in the opposite direction to the urging direction, and normally has a latching surface (5a) (5b) and a locking portion (7a) that holds the other end of the link (4).

(11) is a shaft attached to the mover (5), (12) is a movable contact fixed to one end of the mover (5), (13) is a shaft attached to the base (1), (14) ) Is a tension spring stretched around the shaft (13) and the shaft (11), and (15) is a base (1).
A fixed contact fixed to the stator, (16) fixed contact fixed to the stator (15) so as to face the movable contact (12), and (17) one end of which is electrically connected to the stator (15). Coil,
Reference numeral (18) is a terminal electrically connected to the coil (17), and is for connecting an external conductor (not shown) by the wire retainer (19) and the screw (20).

(21) is a yoke that is attached to the base (1) and forms a magnetic path, and (22) is a push spring (2) when the coil (17) is excited.
Plunger that is attracted to the left in the figure against the spring force of 3), (24) is a bobbin around which the coil (17) is wound, and the plunger (22) is loosely fitted in its hollow part. . (twenty five)
Is a rod that is driven to the left when the plunger (22) is sucked, (26) is a flexible copper stranded wire whose one end is electrically connected to the mover (5), and (27) is flexible. The other end of the copper stranded wire (26) is electrically connected to the bimetal, (28) is a terminal electrically connected to the bimetal (27), and the wire retainer (29)
And an external conductor (not shown) is connected by a screw (30). (31) is an adjusting screw screwed to the terminal (28),
(32) is an insulation tube attached to the bimetal (27),
(33) is an arc runner, one end of which is fixed to the terminal (28) and the other end is fitted in the groove of the base (1). Placed side plate made of inorganic material, (35) is movable contact (12)
An arc extinguishing chamber for extinguishing an arc generated between the fixed contact (16) and the fixed contact (16), and a plurality of grids (36) are supported by a pair of side plates (37) at predetermined intervals.

With the above configuration, the link (4) is connected to both latch surfaces (2) of the mover (5) in both the OFF state of the circuit breaker shown in FIG. 2 and the ON state of the circuit breaker shown in FIG. 5a)
It is held between (5b) and the locking portion (7a) of the locking lever (7). When the handle (2) is rotated clockwise (ON operation) from the OFF state shown in Fig. 2, the inner end (20) of the handle (2) is
The toggle link mechanism formed by 1) and the link (4) extends beyond the dead point, and the mover (5) becomes the shaft (6).
It rotates in the counterclockwise direction around, and the movable contact (12) comes into contact with the fixed contact (16) to be in the ON state shown in FIG. Next, when the handle (2) is rotated counterclockwise (OFF operation), the toggle link mechanism formed by the inner end (201) of the handle (2) and the link (4) bends beyond the dead point,
The mover (5) rotates clockwise around the shaft (6), the movable contact (12) is separated from the fixed contact (16), and the OFF state shown in FIG. 2 is obtained.

Next, when a relatively small overcurrent such as an overload current flows, the bimetal (27) in the state shown in Fig. 4 bends due to its own heat generation, and the tip of the bimetal (27) is bent. When the locking lever (7) is pressed, the locking lever (7) rotates clockwise around the shaft (6) to release the pinching of the other end of the link (4) and attach the tension spring (14). Due to the force, the mover (5) rotates clockwise about the shaft (6) and is separated from the movable contact (16), and the trip momentary state as shown in FIG. 5 is obtained. After that, the handle (2) is rotated counterclockwise by the urging force of the torsion spring (3), and the other end of the link (4) is between the latch surfaces (5a) (5b) and the locking portion (7a). At this position, the link (4) is clamped by the latch surfaces (5a) and (5b) and the locking portion (7a), which is similar to the OFF state shown in FIG. In other words, it is automatically reset. The trip described above is performed with time delay characteristics.

On the other hand, when a large overcurrent such as a short-circuit current flows, the coil (17) is excited, the plunger (22) is attracted against the biasing force of the push spring (23), and the rod (25) is pushed out. Then, the locking lever (7) rotates clockwise about the shaft (6), and the other end of the link (4) is released. After that, the same operation as in the case of the overload current is performed and tripping is performed. It should be noted that this trip is performed with instantaneous characteristics.

[Problems to be solved by the invention]

In the conventional circuit breaker as described above, the locking lever (7)
Is attached to the mover (5) via the shaft (6), the moment the rod (25) pushes the locking lever (7) in the event of a short circuit, the impact force is directly transmitted through the shaft (6). There is a problem in that the movable contact (12) is transmitted to the mover (5), and the movable contact (12) is momentarily separated from the fixed contact (16) to ignite and re-contact to cause welding.

The present invention has been made in order to solve such a problem, and an object thereof is to obtain a circuit breaker in which contact welding is less likely to occur.

[Means for Solving Problems] A circuit breaker according to the present invention is provided with a round hole in a base, a locking lever is directly supported by a round hole in the base by a shaft, and an elliptic hole is provided in a mover. The movable element is supported by the base through the shaft in the oval hole.

[Action]

In this invention, the impact force applied to the locking lever is directly transmitted to the base through the shaft and is not transmitted to the mover.

〔Example〕

FIG. 1 shows an embodiment of the present invention, in which (103) is a round hole provided in the base (1), (5c) is an oval hole provided in the mover (5), and the shaft (6 ) Is passing. The locking lever (7) is directly attached to the round hole (10) of the base (1) by the shaft (6).
It is supported by 3).

Since other configurations are similar to those of the above-described conventional one, the same reference numerals are given and the description thereof is omitted.

With the above configuration, the contact opening / closing operation is the same as that of the conventional one, but when a large overcurrent such as a short-circuit current flows, the coil (17) is excited and the plunger (22) is pushed by the push spring (23). Sucked against the urging force of the rod (25)
Is pushed out, and the locking lever (7) pivots clockwise about the shaft (6) to release the other end of the link (4). At this time, the impact force applied to the locking lever (7) is directly transmitted to the base (1) via the shaft (6), and is relieved to the mover (5) by the elliptical hole (5c), so that the contact point is released. (12)
The separation of (16) does not occur.

In addition, in the above-described embodiment, the case where the housing is the base (1) and the round hole (103) is provided in the base (1) is shown.
A support plate base for supporting the toggle link mechanism, the mover (5), and the locking lever (7) may be mounted in the housing, and the same effect as that of the above-described embodiment is obtained.

[Effect of device]

As is apparent from the above description, the present invention provides a round hole in the base, and the locking lever is directly supported by the shaft in the round hole in the base. Since it is supported by the base through the circuit breaker, it is possible to obtain a circuit breaker in which contact welding is unlikely to occur.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of the essential part of this invention. 2 to 5 show a conventional circuit breaker, FIG. 2 is a side sectional view, FIG. 3 is an exploded perspective view of essential parts, FIG. 4 and FIG.
Each of the drawings is a side sectional view for explaining the operation. (1) ... Base, (2) ... Handle, (4) ... Link, (5) ... Mover, (5c) ... Oval hole, (6) ...
… Axis, (7) …… Locking lever, (12) …… Movable contact,
(103) …… Round hole. In each figure, the same reference numerals indicate the same or corresponding parts.

Front Page Continuation (72) Inventor Yoshiaki Kobayashi 1-8 Midoricho, Fukuyama-shi, Hiroshima Mitsubishi Electric Co., Ltd. Fukuyama Factory (72) Inventor Kiyoshi Matsuura 1-8 Midoricho, Fukuyama-shi, Hiroshima Mitsubishi Electric Corporation Fukuyama Factory

Claims (4)

[Scope of utility model registration request] 1. A handle supported by a base and rotatable, a link having one end rotatably connected to the handle to form a toggle link mechanism together with the handle, and an elliptical hole formed in the base. A mover that is rotatably supported by an oval hole and has a movable contact at one rotation end, and a mover that is rotatably supported by a round hole of the base and that is always connected to the mover and the link. As described above, the locking lever that locks the link, and when an overcurrent of a predetermined value or more flows, the locking lever is rotated to release the connection between the link and the mover, and the movable contact is a fixed contact. And a circuit breaker having an overcurrent trip means for disconnecting the circuit breaker. 2. The circuit breaker according to claim 1, wherein the base is a housing having an opening. 3. The circuit breaker according to claim 1, wherein the base is a support plate mounted in the housing and supporting the toggle link mechanism, the mover and the locking lever. 4. The circuit breaker according to claim 1, wherein the overcurrent trip means is a coil having a plunger for actuating a locking lever.