JPH0810572B2 - Circuit breaker - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a circuit breaker for wiring, and more particularly to a tripping mechanism thereof.

[Background of the Invention]

In general, the trip mechanism of the circuit breaker is kept in the locked state by the slight locking force and the locking dimension of the trip members, so it is affected by the impact when the movable contact is released by the handle. There is a case where the stop state is released and the state becomes the same as that at the time of trip. Especially, in the case of a circuit breaker having an attached device for performing trip display, such a mistrip is very inconvenient.

Conventionally, as shown in FIGS. 7 and 8 in order to prevent mis-trips, when the movable contactor 2 is opened by operating the handle, the pusher 25 that cooperates with the operating lever 8 is the first of the tripping mechanisms. There is a structure in which the tripping member 16 is pressed to prevent the tripping member from rotating in the trip direction (clockwise direction in FIG. 8) (see Japanese Utility Model Publication No. 53-43494).

However, since the pressing force of the pusher 25 acts as a force P ₂ in the direction of returning the second tripping member 20 of the tripping mechanism to the normal position when the reset operation of the quick disconnect / quick entering mechanism 1 is performed from the trip state. Before the quick-break quick-insert mechanism 1 is reset, the engaging portion 23 of the first trip member 16 and the second trip member 20 is formed, and as a result, the hook 6 of the quick-break quick-entry mechanism is removed by the second trip. The member 20 cannot be locked, and resetting becomes impossible.

As a countermeasure against this, the force of the spring 22 applied to the second tripping member 20 is strengthened so that the second tripping member 20 does not return to the normal position due to the pressing force of the pusher 25, or the second tripping member 20 is pressed. Although it is conceivable to change the dimensions, both of them increase the tripping load during tripping, so that the tripping characteristic becomes unstable, which is not preferable.

[Object of the Invention]

An object of the present invention is to enable a reset operation after tripping to be carried out smoothly and surely while preventing a mistrip.
Another object is to provide a circuit breaker with stable trip characteristics.

[Outline of Invention]

The present invention relates to a quick disconnection / fast insertion mechanism associated with an operating lever, a first tripping member that rotates in the trip direction against the first biasing means by the operation of an overcurrent responding device, and a contact when it is in an ON state. A second engaging member that makes a first engagement with the first trip member and is released from the first engagement during a trip, and is interlocked by a second urging unit in the same direction as the first trip member.
By releasing the second engagement between the tripping member, the hook of the quick disconnect / fast entry mechanism and the second tripping member at the time of the trip, the hook rotates to turn off the contact, and the operation is performed. In a circuit breaker configured to perform the second engagement with the hook again by the pusher that pushes the first trip member in the anti-trip direction in conjunction with the reset operation of the lever, The line of action of the force applied to the first trip member by the reset operation is
The second tripping member is moved from the trip position to the hook by an inclined portion provided on the first tripping member so as to pass through the first tripping member side with respect to the rotation fulcrum shaft of the second tripping member. And the second engagement with the second tripping member without disturbing the reset rotation operation by the hook by temporarily making the rotation opposite to the direction in which the second engagement is performed. It is characterized in that it is configured to return to.

Example of Invention

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a diagram showing the overall structure of an embodiment of the circuit breaker according to the present invention.

Reference numeral 1 denotes a quick disconnection quick insertion mechanism, which is connected to a lower link 3 connected to a movable contact 2, an upper link 5 connected to the movable contact 2 via a pin 4, a hook 6 engaged with the upper link 5, and a handle 7. The operating lever 8 and a spring 9 mounted between the operating lever 8 and the pin 4. 10 is a fixed contactor.

11 is an overcurrent response device, which is an electromagnetic coil 12, yoke 13, magnetic pole 1
4, It is composed of movable iron pieces 15.

Reference numeral 16 is a first tripping member which is connected to a common tripping shaft 17 of each pole and rotates around a fulcrum shaft 18, and 19 is attached to the first tripping member 16 in an anti-trip direction (counterclockwise direction in the figure). A spring that gives a rotational force, 20 is a second that rotates around a fulcrum shaft 21
A tripping member, 22 is a spring that applies a rotational force to the second tripping member 20 in the trip direction (clockwise direction in the figure), and 23 is the first
An engaging portion formed between the tripping member 16 and the second tripping member 20, 24 is an engaging portion formed between the second tripping member 20 and the hook 6 of the quick disconnect / insert mechanism, and 16a is a first engaging portion. 1 Tripping member 1
Reference numeral 20a, which will be described later, provided on 6 is a reset engaging portion of the second tripping member 20.

The first tripping member 16 and the second tripping member 20 form a tripping mechanism between the quick disconnect and quick entry mechanism 1 and the overcurrent responding device 11.

Numeral 25 is a pusher (leaf spring) for preventing mis-trip, which cooperates with the operating lever 8.

2 to 5 are operation explanatory views, and FIG. 2 is an ON state,
Fig. 3 shows the trip state, Fig. 4 shows the state during resetting,
FIG. 5 shows the off state.

When an overcurrent flows in the ON state shown in FIG. 2,
Since the overcurrent responding device 11 operates and the common trip shaft 17 is pushed by the movable iron piece 15, the first trip member 16 moves the spring 19
Rotate in the trip direction (clockwise direction in the figure) against. As a result, the engaging portion 23 of the first tripping member 16 and the second tripping member 20 is disengaged, and the second tripping member 20 is released by the spring 22 in the clockwise direction, that is, the engagement with the hook 6 of the quick disconnect / fast entry mechanism is released. Rotate in the direction of breaking. Second tripping member 20 and hook 6
When the engaging portion 24 is released, the movable contact 2 is separated via the upper link 5 and the lower link 3 by the counterclockwise rotation of the hook 6, and the trip state shown in FIG. 3 is obtained. At this time, the second tripping member 20 is rotated to a position where its tip end engages with the inclined portion 16a of the first tripping member 16.

When the handle 7 is rotated clockwise during reset,
The hook 6 interlocks with the operating lever 8 at the engaging portion 26. FIG. 4 shows a state in which the pressing member 25 starts to contact the first trip member 16 during resetting. When the handle 7 is further rotated in the clockwise direction, the pressing force of the pressing member 25 is combined with the force of the spring 19 and acts on the first trip member 16 as a rotational force in the counterclockwise direction, that is, the anti-trip direction. On the other hand, the hook 6 hits the reset engaging portion 20a of the second tripping member 20, and counteracts the second tripping member 20 counterclockwise against the spring 22.
That is, it is rotated in the direction of returning to the normal position. As a result, the engagement between the second tripping member 20 and the inclined portion 16a of the first tripping member 16 is released, and the handle 7 is returned to the first tripping member 16 and the second tripping member 16 as shown in FIG. The engagement portion 23 of the trip member 20 and the engagement portion 24 of the second trip member 20 and the hook 6 are formed, and the breaker is turned off.

During the resetting operation, the pusher 25 is bent, and the load applied to the first trip member 16 immediately before the completion of the resetting is maximized.

As a matter of course, it is possible to operate the handle 7 from the on state shown in FIG. 2 to the off state shown in FIG. 5 or vice versa.

Next, the direction of the force received by the second trip member 20 during resetting will be described in comparison with the conventional direction.

FIG. 7 is an explanatory view of the conventional one. P ₂ is the second tripping member 20 due to the resultant force of the pusher 25 and the spring 19 during resetting.
Is a force received from the engaging portion 16b of the first trip member 16, and the angle θ ₂ formed between the engaging portion 16b of the first trip member 16 and the locking portion 23 is θ ₂ ≈90 °. , P ₂ is the second force
A rotational force P ₂ · l ₂ (l ₂ is the distance from the center of the fulcrum shaft 21 to the line of action of the force P ₂ ) in the counterclockwise direction, that is, the direction of returning to the normal position is applied to the trip member 20. This rotational force P ₂
When l ₂ becomes larger than the rotational force of the spring 22 applied to the second trip member 20, the second trip member 20 rotates counterclockwise and the state shown in FIG. 8 is obtained.

In the state shown in FIG. 8, since the locking portion 23 of the first tripping member 16 and the second tripping member 20 is already formed, the hook 6 crosses over the locking portion 24 of the second tripping member 20. It cannot be reset and cannot be reset.

In order to prevent inability to reset in this way,
In this embodiment, as shown in FIG. 6, the first trip member 16 is provided with an inclined portion 16a having an angle θ ₁ with the engaging portion 23 of θ ₁ <90 °. 2 The tip of the tripping member 20 is adapted to be engaged. By doing so, the line of action of the force P ₁ received by the second trip member 20 due to the resultant force of the pusher 25 and the spring 19 at the time of resetting passes from the fulcrum shaft 21 to the overcurrent responding device 11 side, and then the second trip member. The member 20 is given a clockwise method, that is, a rotational force P ₁ · l ₁ (l ₁ is the distance from the center of the fulcrum shaft 21 to the line of action of the force P ₁ ) in the direction opposite to the direction of returning to the normal position. Therefore, as in the conventional example shown in FIGS. 7 and 8, the engaging portions 23 of the first tripping member 16 and the second tripping member 20 are formed in the middle of the resetting operation so that the resetting cannot be performed. There is no fall. Also, a spring added to the second tripping member 20 to prevent the resetting from becoming impossible.
Since there is no need to increase the force of 22, the trip load will not increase. In this case, since the rotational force applied to the second trip member 20 by the force P ₁ and the spring 22 is smaller than the handle operating force, the reset operation for locking the hook 6 on the second trip member 20 is performed smoothly. be able to.

In the above-described embodiment, the pusher that cooperates with the operation lever 8
Although 25 is provided to prevent mis-trip, the present invention is effective even when the pressing element 25 is not provided, because mis-strip can be prevented by increasing the force of the spring 19 applied to the first trip member 16.

〔The invention's effect〕

According to the present invention, when the force in the anti-trip direction applied to the first trip member is increased in order to prevent a mistrip, the second trip member receives the force from the first trip member at the time of resetting, and the quick disconnect / return mechanism and the re-engagement mechanism. It is possible to prevent resetting to the normal position before engaging and making resetting impossible.In addition, the tripping load does not increase and the tripping characteristic becomes unstable, and the resetting operation can be performed smoothly. A highly reliable circuit breaker can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing the overall structure of an embodiment of a circuit breaker according to the present invention, FIG. 2 is a partial side view in an ON state, FIG. 3 is a partial side view in a trip state, and FIG. 4 is a reset. Partial side view during operation, FIG. 5 is a partial side view in the off state, FIG.
FIG. 7 is an explanatory view showing the direction of the force applied to the second trip member of the present embodiment, FIG. 7 is an explanatory view showing the direction of the force applied to the second trip member of the conventional example, and FIG. 8 is the conventional example. It is a side view showing a state in which resetting is impossible. 1: Quick-breaking quick-entry mechanism, 7: Handle, 11: Overcurrent response device, 16:
1st tripping member, 20: 2nd tripping member, 16a: inclined part of 1st tripping member

Claims (1)

[Claims] Claim: What is claimed is: 1. A quick disconnection quick entry mechanism associated with an operating lever, a first tripping member which rotates in the trip direction against the first biasing means by the operation of an overcurrent responding device, and an ON state of a contact. Occasionally, the first trip member is engaged with the first trip member, and when the trip occurs, the first engagement is released.
In the same direction as the tripping member, the second tripping member that is interlocked by the second biasing means, and the second engagement between the hook of the quick disconnect / fast-injection mechanism and the second tripping member at the time of the trip. When the hook is released, the hook rotates to turn off the contact, and in conjunction with the reset operation of the operation lever, the pusher that pushes the first trip member in the anti-trip direction causes the hook and the second trip member to move again. In the circuit breaker configured to perform the engagement, the line of action of the force applied to the first trip member by the resetting operation of the pusher is more than that of the rotation fulcrum shaft of the second trip member. An inclined portion provided on the first trip member so as to pass through the first trip member side causes the second trip member to move from the trip position in a direction opposite to a direction in which the hook engages with the second engagement. Once turn waiting The circuit breaker is configured to return to the second engagement with the second tripping member without being hindered by the hook in the reset rotation operation by being driven.